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Abstract
The flow over a wedge with activation energy and chemical reaction gains widespread applications in compound creations, food processing, insulation, oil reservoirs, catalysis, etc. The vast applicability of activation energy with a binary chemical reaction comprising multiple diffusions and the time-dependent nature of the entropy-optimized flow has drawn our attention to this work. The consequences of time, activation energy, liquid hydrogen and oxygen diffusions, and magnetic field over a wedge in the quadratic combined convection flow with entropy analysis are explored to achieve more mechanically realistic outcomes. The nonlinear dimensional coupled partial differential equations (PDEs) that govern the modelled phenomenon are tackled with non-similar transformations, the Quasilinearization technique followed by an implicit finite difference scheme and Varga’s matrix inverse procedure. The entropy generation can be minimized by upsurging the magnitude of the temperature difference ratio attribute . The higher wedge angle results in a lower fluid motion.
Nomenclature
= | Cartesian coordinates | |
= |
| |
= | Mainstream velocity | |
= | Mainstream velocity constant | |
= | Species concentration | |
= | Specific heat | |
= | Fluid temperature | |
= | Wall temperature | |
= | Time | |
= | Nondimensional stream function | |
= | Ambient fluid temperature | |
= | Nondimensional velocity | |
= | Nondimensional temperature | |
H, S | = | Dimensionless species concentration of liquid hydrogen and oxygen |
K | = | Thermal conductivity |
= | Mass diffusivity | |
= | Buoyance ratio parameters for liquid hydrogen and oxygen | |
= | Acceleration due to gravity | |
= | Richardson number | |
= | Prandtl number | |
= | Schmidt number | |
= | Gas constant | |
= | Local surface drag coefficient | |
= | Local strength of heat transfer | |
= | Local strength of mass transfer | |
Br | = | Brinkman number |
Be | = | Bejan number |
= | Diffusion parameters | |
= | liquid hydrogen & oxygen rate constants | |
= | Activation energy for liquid hydrogen & oxygen | |
= | Chemical reaction rate constants for liquid hydrogen & oxygen | |
= | Chemical reaction parameters | |
= | Activation Energy parameter for liquid hydrogen and oxygen | |
= | Wedge angle parameter | |
= | Wedge angle | |
= | Magnetic parameter | |
= | Constant magnetic field strength | |
= | Dimensional axial distance |
Greek symbols
= | Stream function | |
= | Transformed variables | |
= | linear and quadratic thermal expansion coefficients | |
= | Liquid hydrogen's linear and quadratic concentration expansion | |
coefficients | = | |
= | Liquid oxygen's linear and quadratic concentration expansion |
Coefficients
= | Nondimensional time | |
= | Unsteady parameter | |
= | Unsteady function of | |
= | Boltzmann constant | |
= | Quadratic convection parameter for temperature | |
= | Nonlinear convection parameter for liquid hydrogen | |
= | Nonlinear convection parameter for liquid oxygen | |
= | temperature difference ratio | |
= | liquid hydrogen concentration difference ratio | |
= | liquid oxygen concentration difference ratio |
Subscripts
= | Partial derivatives with respect to | |
= | at the surface and away from the surface, respectively |
1. Introduction
Svante Arrhenius, a Swedish scientist introduced the Activation Energy (AE) concept for the first time in 1889. The minimum energy the chemical species requires to instigate a chemical reaction is known as the AE. The AE is different for different chemical reactions and may be zero for some chemical reactions. Bestman [Citation1] was probably the first to work on a binary chemical reaction with AE. Numerous industrial applications involve binary chemical reactions with AE. Examples are geothermal artificial lake retrieval, atomic reaction rotting, food processing, insulation, oil reservoirs, compound creations, catalysis, thermal lubricant retrieval, ceramics production, biochemical systems, and many more. Given these numerous applications, many researchers [Citation2–10] have worked on this concept of AE. Dhlamini et al. [Citation2] have discussed the effects of AE and convective boundary conditions over an infinitely long plate. They concluded that AE enhances the concentration profile significantly. Ali et al. [Citation3] explored the AE on the 3D flow of cross nanofluid. The effect of AE, thermal radiation, and entropy generation in a quadratic combined convective flow of nanofluid was investigated by Alsaadi et al. [Citation4].
Triple (multiple) diffusion flows can be achieved by taking the temperature diffusion with two different species or considering three different diffusing species. The stratospheric warming, underground water flow, food processing, etc., involves multiple diffusions. There are very limited studies on triple diffusion [Citation11–14]. Since the process of AE can be seen in a binary chemical reaction, one can confine the binary reaction by employing a particular species concentration to attain more perfection in the results. For example, liquid hydrogen, liquid oxygen, etc., can be taken as a particular species concentration. In the space programme, liquid hydrogen is used in enormous quantities as a major rocket fuel for oxygen combustion and cooling the aircraft engine. In the propellant systems of missiles and rockets, liquid oxygen is an oxidant for liquid fuels. By incorporating diffusions of specific species namely liquid hydrogen and oxygen, activation energy applications can be expanded.
Each and every flow in nature and industry is connected with time, and time has a very significant impact on the thermal engineering properties [Citation15–19]. Unsteady or time-dependent [Citation20–23] flow problems are vital in many engineering disciplines. For example, the interaction of rotating and stationary parts in a piston engine, turbomachinery, helicopter aerodynamics, etc. Many academicians do not focus on unsteady flow problems because of their difficulties, despite their applications. However, very recently, Noor et al. [Citation20], Jenifer et al. [Citation21], and Daniel et al. [Citation22] have examined the unsteady flow nature over different geometries and concluded that velocity declines for improving values of the unsteadiness parameter.
The entropy, a thermodynamic function, embodies the system's functioning status. Inability of a system to transfer thermal energy into mechanical energy is known as “Entropy”. Entropy generation (EG) must be kept to a minimum for engineering systems to function well. For example, air-conditioning systems, heat exchangers, fuel cells, units of thermal power stations, etc. to work efficiently. Bejan [Citation24] was the one who proposed the concept of EG in 1982 for the first time. Several works were made by considering the analysis of EG [Citation25–27] and the effect of AE over the period [Citation4, Citation6,Citation7]. The results reveal that for higher Brinkman numbers, EG is enhanced for forced convection when there is a significant magnetic field. Due to the significant impact of EG in engineering, it is very important to minimize the EG in the system.
Studies over a wedge attracted researchers due to its significant applications in aerospace, pharmaceuticals, oil and gas industries, thermal insulation, dams, designing of disks for engine gate valves etc. Owing to these important industrial applications, some researchers [Citation28–35] discussed the impact of different effects on the wedge. Watanabe et al. [Citation28] solved the problem on a wedge with uniform suction /injection using the difference-differential method. By using magnetohydrodynamics (MHD), Kafoussias and Nanousis [Citation29] extended Watanabe et al. ‘s [Citation28] investigation and demonstrated that a magnetic field slows the fluid's velocity. The non-similarity solution to the wedge with the unsteady flow in a bi-convective region was given by Singh et al. [Citation30]. A work on a wedge was conducted by Kumari et al. [Citation31] in a porous medium. These studies are restricted to only similarity solutions. The overshoot in the velocity due to buoyancy reduces for increasing time. This study is then protracted to account for non-uniform slot injection/suction by Ganapathirao et al. [Citation32].
The temperature and concentration variance in the flow around a wedge at a high temperature will not be linear in most cases. So, one has to overcome this difficulty by involving nonlinear (quadratic) combined convection [Citation4–6, Citation36]. This novel concept is important in combustion, crude oil extraction, thermal systems, electronic parts cooling, etc. Alsaadi et al. [Citation4], Ramreddy and Naveen [Citation5], and M. I. Khan et al. [Citation6] have looked into the effect of activation energy on quadratic combined convective flow. Further, vast applicability of Magnetohydrodynamics (MHD) in the engineering processes, it has been studied extensively. The study of applied magnetic field characteristics in the fluid flows that conduct electricity is known as Magnetohydrodynamics (MHD). By applying the magnetic field, one can delay the boundary layer separation [Citation37]. Recently, a number of works made to find out the effects of MHD [Citation38–42] over Newtonian, non-Newtonian fluids with different effects like radiation, rotation etc.
According to the above literature review, noresearchers have throw a light on the impact of time, activation energy, and magnetic field over a wedge with nonlinear (quadratic) combined convection and multiple diffusions. As a result, the present study is intended on the following concepts:
The mass transfer concerning binary activation energy and chemical reaction.
The magnetized field effects on flow characteristics.
Impact of time-dependent flow nature.
Effect of liquid hydrogen and oxygen diffusion.
Quadratic combined convection effect over the flow field.
The entropy optimization.
2. Mathematical formulation
A 2-D laminar flow of an incompressible fluid (water) is considered in the direction of axis and
axis is perpendicular to it. The
and
axis are used to measure the velocity components
and
. An external magnetic field is applied in
-direction. The species components, liquid hydrogen and liquid oxygen diffusion, are considered, and equivalent realistic values of Schmidt numbers 160 and 340 at 270C are considered [Citation43]. The temperature variations between the fluid and the wall are thought to be quadratic in nature. The wall and ambient fluid temperature are taken to be
and
. Similarly, the concentration of liquid hydrogen
and liquid oxygen
at the wall, and away from the wall are considered to be
and
, respectively. The wedge angle is taken as
and the half-angle of the wedge
as shown in . Employing the Oberbeck-Boussinesq approximation for the buoyancy [Citation44, Citation45], the physical properties of MHD, quadratic combined convection, and activation energy in the presence of time are represented by the following equations [Citation30–32, Citation36]:
(1)
(1)
(2)
(2)
(3)
(3)
(4)
(4)
(5)
(5) The initial conditions of the problem are:
(6)
(6) The boundary constraints are:
(7)
(7) Non-similar transformations:
With the help of the above transformations, equation (Equation1
(1)
(1) ) is satisfied trivially, and one can reduce eqs. (2)-(5) to nondimensional form in terms of
as follows:
(8)
(8)
(9)
(9)
(10)
(10)
(11)
(11) Equivalent boundary conditions:
(12)
(12)
Let
be the dimensionless distance along the wedge
. Then, the nondimensional equations in terms of
are:
(13)
(13)
(14)
(14)
(15)
(15)
(16)
(16) Pertinent boundary conditions are:
(17)
(17)
Here
, where
for the impervious surface.
The following engineering quantities give the constraints at the surface:
Surface drag coefficient:
(18)
(18) Energy transport strength:
(19)
(19) Mass transfer strength due to liquid hydrogen:
(20)
(20) Similarly, mass transfer strength due to liquid oxygen:
(21)
(21)
2.1. Entropy generation
The following expression represents the entropy generation for the present modelled problem [Citation4, Citation6,Citation7, Citation11, Citation45–48]:
The first term HTI in the expression is that the EG results from heat transmission, whereas the second term FFI induces the EG by viscous dissipation or fluid friction. Next term is the EG due to the magnetic field. Further, EG induced by the diffusion of liquid oxygen and hydrogen is given by the fourth term DI.
is nondimensionalized
by utilizing the characteristic entropy rate
.
The expression for the Bejan number is given by:
3. Numerical procedure
The following are the set of linear equations obtained by employing the Quasilineazation technique [Citation36, Citation49–52] to the dimensionless eqs. (13)-(16).
(22)
(22)
(23)
(23)
(24)
(24)
(25)
(25)
The equivalent boundary conditions are:
(26)
(26) The obtained set of linear equations (22)-(25) is subjected to the implicit finite difference technique [Citation36, Citation53–56]. After that, Varga’s matrix inverse technique [Citation57] is implemented to tackle the block tri-diagonal coefficient matrix. The answer is reached iteratively with a precision of 10−4. i. e.,
The coefficients of equations (22)-(25) are:
3.1. Comparison of the current outcomes
The current steady-state findings of and
are compared with those of Singh et al. [Citation30] and Kumari et al. [Citation31] in Table . The comparison reveals that the present outcomes are in good accord.
Table 1. A comparison of the current time-independent findings with [Citation30] and [Citation31] at .
4. Results and discussion
The parameter ranges taken into account to analyze the physical understanding and the flow behaviour of the results taken are as follows: ,
,
,
,
,
,
,
,
,
,
i.e.
and the values of a few parameters are kept constant, such as,
(water),
,
,
,
,
. Further, realistic values of the Schmidt number for liquid hydrogen
and liquid oxygen
at 270 C [Citation32] are considered.
4.1. Variations of the wedge angle
The impact of wedge angle parameter and time
on velocity profile
, surface drag coefficient
, and mass transfer rates of liquid hydrogen and oxygen
for accelerating
, and decelerating flows
are deliberated in Figures . The wedge angle
is directly proportional to
i.e. when
,
when
,
and when
,
. The increasing values of
result in higher fluid velocity, surface drag coefficient and mass transfer rates for both
and
. Physically, by increasing the wedge angle, the fluid’s motion becomes more in the region near the wedge surface as the wedge becomes less slanted. Again, if the velocity is higher, the friction between the fluid particles and the wedge surface gradually improves and, consequently, the mass transfer rate. Also, it is inferred from Figures that, as time surpasses,
diminishes and concurrently
,
enhance for
, reduce for
. Particularly at
,
,
surge approximately 11%, 10%, 7% respectively for
as the wedge angle becomes 600 from 300.
4.2. Magnetized field effect
Figures and explain the impact of the magnetic parameter along with the axial distance
and time
on the velocity profile
and the corresponding gradient
. It is concluded from these figures that,
and
show the decaying nature for improving estimations of both
and
. This is exemplified by the fact that enhancement in the values of
induces a retarding force called the Lorentz force, which opposes the fluid’s motion and lessens the surface friction coefficient. Further, augmentation in
functions as a negative pressure gradient in the momentum boundary layer. For instance,
diminishes approximately 64% whenever
rises from 0 to 2 at
,
for
. The enrichment in the values of
detracts
and propels the
for
. The opposite nature is seen for
in case of
.
4.3. Quadratic combined convection effect on concentration profile and mass transfer rate
The variation of species concentration profiles and the mass transfer rates
for distinct values of quadratic mixed convection parameter
and time
are outlined in Figures and . It is known from the figures that the concentration profiles
weaken, and mass transfer rates intensify when mixed convection becomes nonlinear (quadratic) from linear one
. That is why the temperature disparity between the wedge surface and adjacent fluid becomes more significant. The species concentration profile lessens, and mass transfer boosts liquid oxygen diffusion
more than liquid hydrogen diffusion
. For example, the mass transfer rate boosts up approximately by 9% for
in comparison with
. Also, the boundary layer thickness is minimum for a higher Schmidt number
. Figure elucidates that mass transfer rates
escalate for accelerating flow and lessen for decelerating flow.
4.4. Activation energy effects
Figures display the influence of activation energies with chemical reaction parameters
over liquid hydrogen
and liquid oxygen
concentration profiles and their corresponding mass transfers
. The activation energy produces the least energy to the molecules or atoms to start a chemical reaction. This phenomenon allows us to investigate the supremacy of mass transportation using Arrhenius activation energy due to the binary chemical reaction. As seen by Figures and , the activation energy boosts liquid hydrogen and oxygen concentration distributions, while Kc lowers the concentration distribution. Meanwhile, the opposite kind of nature can be seen in their mass transfer coefficients for the same values of activation energy and chemical reaction parameters. This behaviour is due to advanced values of the chemical reaction parameter leading to more destructive chemical reactions.
On the other hand, a low temperature and high activation energy result in a slower reaction rate. This results in higher species concentration and a lower mass transfer rate for higher activation energy. So, the mass transfer augments for enhanced values of chemical reaction parameters. In particular, when the chemical reaction parameter goes from 0.5–1.5, the mass transfer rates of liquid hydrogen and oxygen go up by about 23% and 25%, respectively, at ,
.
4.5. Effect of linear and nonlinear (quadratic) mixed convection
Figures and explore the combined effects of mixed and quadratic mixed convection
parameters over gradients of velocity and temperature, along with the time for accelerating and decelerating flows. The surface friction
and energy transfer rate
are enhanced when mixed convection becomes nonlinear (quadratic) from linear
in the case of aiding buoyancy flow
. The opposite trend is incurred in the case of opposing buoyancy flow
. Particularly, surface friction coefficient and energy transfer rate increased by approximately 15% and 10% when
rises from 0 to 1 at
, respectively. It is because rising values of
signifies the larger temperature difference between the wall and ambient fluid temperature. It is observed that mixed convection enhances
,
as it influences a positive pressure gradient. Further, the time has a commanding impact on these quantities. It improves the friction and energy transfer rate for accelerating flow
and the decelerating flow
lessens the friction and energy transfer rate.
4.6. Consequences of entropy generation and Bejan number
The entropy generation (EG) and Bejan number
have been analyzed. The results are graphed in Figures for the variations of Brinkman number
, Reynolds’ number
and temperature difference ratio attribute
. The higher values of
and
escalate the
and consequently de-escalate the
. The larger values of
indicate the slower conduction of heat produced due to viscous dissipation; hence fluid temperature becomes more and so does the EG. Also, the
increases and
decreases as time surpass. It is noted from Figures , and that the fluctuations near the wall are due to the randomness in the system. Further, these fluctuations can be avoided by enhancing the magnitude of
as seen in Figure . The EG can be minimized by upsurging the magnitude of
as witnessed in Figure , and the
has the opposite nature, as it is inversely proportional to the EG. It can be concluded from the Figures that the EG can be reduced by considering the larger magnitudes of
and lower magnitudes of Re and Br.
5. Conclusions
The influence of numerous emerging parameters on velocity, temperature, concentration profiles, and multiple gradients is described and graphically displayed. The discussions mentioned above resulted in the following findings:
The mass transfer rates augment for enhanced values of chemical reaction parameters. In particular, when the chemical reaction parameter goes from 0.5–1.5, liquid hydrogen and oxygen mass transfer rates increase by about 23% and 25%, respectively, at
,
.
Enhancing the wedge angle parameter
upsurges the surface drag coefficient and mass transfer rates. Particularly at
, surface drag, mass transfer rates for liquid hydrogen and oxygen surge approximately 11%, 10%, 7%, respectively, for accelerating flow as the wedge angle becomes 600 from 300.
It is noted that fluid velocity and surface friction show the decaying nature for improving estimations of both
and
. For instance, the surface friction diminishes approximately 64% whenever
rises from 0 to 2 at
,
for
.
When mixed convection transitions from linear to nonlinear (quadratic)
, the surface friction and energy transfer ratestrengthen by about 15% and 10% when
growths from 0 to 1 at
.
The advanced values of
and
escalate the EG and consequently de-escalate the Bejan number. The larger values of
indicate the slower conduction of heat produced due to viscous dissipation; hence fluid temperature becomes more, and so does the EG.
The fluctuations near the wall in
are due to the randomness in the system. Further, these fluctuations can be avoided by enhancing the magnitude of
.
The EG can be reduced by considering the larger magnitudes of
and lower magnitudes of Re and Br.
Acknowledgement
The second author is thankful for the fellowship from the Department of Science and Technology-Innovation in Science Pursuit for Inspired Research (DST-INSPIRE), New Delhi.
Disclosure statement
No potential conflict of interest was reported by the author(s).
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