Consequence of nanoparticle physiognomies on heat transfer characteristics of heat exchanger

ABSTRACT

In this paper, the heat transfer coefficient and the heat transfer rate of a heat exchanger is evaluated by using nanofluids. The silicon carbide nanoparticles, milled and sonificated as nanofluids with volume fractions of 0.01499(%) and 0.01399(%) are used. The heat transfer characteristics of SiC(P)/water, SiC(M)/water, SiC(P)/EG, and SiC(M)/EG are measured in a concentric tube heat exchanger under laminar flow condition. The consequence of nanoparticle physiognomies and Reynolds number, on the heat transfer characteristics are evaluated. It has been found that the addition of milled nanoparticle in the base fluids enhances the heat transfer characteristics rather than the normal nanoparticle. The experimental results shows that the heat transfer coefficient rate of SiC(M) is higher than that of SiC(P) in both the case of water and EG. Further the Reynolds number and Nusselt number for SiC (M) was found higher than SiC (P), which is essential for heat transfer flow.

KEYWORDS:

• Nanofluids
• SiC/DIW
• SiC/EG
• stability
• heat transfer coefficient
• thermal conductivity
• Reynolds number
• Nusselt number

Nomenclature

Symbols

knf	=	Thermal conductivity of nanofluids (W/mK)
h	=	Heat transfer coefficient (W/m2 K)
Re	=	Reynolds Number
Nu	=	Nusselt number
V	=	Velocity of flow
µ	=	Dynamic viscosity of fluid
kf	=	Thermal conductivity of base fluid (W/m K)
kp	=	Thermal conductivity of nanoparticles (W/m K)

Subscripts

SiC (M)	=	Silicon carbide (milled)
SiC(P)	=	Silicon carbide (normal)
CW	=	Cold water
PF	=	Parallel flow
CF	=	Counter flow
nf	=	Nanofluid
DI water	=	DE ionized water
S	=	Nanofluid entrance status

Additional information

Notes on contributors

Senthil Ramalingam

Senthil Ramalingam is professor in mechanical engineering and Dean, University college of Engineering, Villupuram-Villupuram. He received the Ph.D. degree in Internal-combustion engines through the Anna University Chennai, in 2000. His primary research interests are internal-combustion machines, green energies as well as heat transfer programs. He has got 20+ many years of teaching, training and analysis with 70+ technical reports published in worldwide journals and seminars.

Ratchagaraja Dhairiyasamy

Ratchagaraja Dhairiyasamy obtained the Master of Engineering level in Thermal Engineering from Anna University Chennai, in 2008. Presently the writer Ph.D. this is certainly performing with time in the region of heat transfer improvement utilizing nanofluids within the division of mechanical engineering, University college of Engineering, Villupuram.

Mohan Govindasamy

Mohan Govindasamy is with the department of Mechanical Engineering, University College of Engineering-Villupuram, Villupuram, TN, India. He obtained his undergraduate degree in Mechanical Engineering (2008) from Annamalai University, Post graduate in Production Engineering (2010) from PSG College of Technology and Ph.D. (2018) from Anna University, Chennai, India. His main research interests are internal combustion engines, renewable energies and heat transfer applications. He has 10+ years of teaching and research experience with 20+ technical papers published in international journals and conferences.