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ABSTRACT
Turbulent convection of fluid flow through the impingement round jets solar air rectangular passage with circular inside conical ring obstacle shapes is studied experimentally. The testing of a rectangular solar air passage with round impinging jet contains; relative inside conical ring height ( lies from 0.073–0.128, ratio of inlet flow diameter to inner print diameter of ring (
lies from 1.3–2.3, ratio of ring diameter to ring height
/
lies from 1.67–2.67, relative X-axis pitch (
lies from 4.71–7.71, relative Y-axis pitch (
lies from 2.92–5.14, relative impingement round jets diameter (
and Reynolds number (Re) of flow was varied between 5,000 to 23,000. The fixed values of relative impingement round jets diameter (
of 0.366, relative X-axis jet distance (
of 0.366, and relative Y-axis jet distance (
of 0.311 were selected. The highest value of hydrodynamic and thermal performance is observed at
of 0.110,
of 1.7,
/
of 2.33,
of 5.28,
of 3.42,
of 0.055,
of 0.366, and
of 0.311.
Nomenclature
| = | Area of intense heated wall(m2) | |
| = | Area of flow (m2) | |
| = | Area of orifice meter (m2) | |
| = | Coefficient of discharge of orifice meter | |
| = | Specific heat of air (J/kg K) | |
| = | Inner print base diameter of inside conical ring (m) | |
| = | Hydraulic diameter of impingement round jets solar air collector (m) | |
| = | Impingement round jets diameter (m) | |
| = | Relative impingement round jets diameter | |
| = | Inlet flow diameter of inside conical ring (m) | |
| = | Ratio of inlet flow diameter to inner print diameter of ring | |
| = | Outer diameter of inside conical ring (m) | |
| = | Ratio of ring diameter to ring height | |
| = | Diameter of orifice meter (m) | |
| = | Friction factor | |
| = | Friction factor with roughness shape | |
| = | Friction factor for smooth wall | |
| = | Height of inside conical ring or obstacle (m) | |
| = | Relative inside conical ring height | |
| = | Height of air passage (m) | |
| = | Heat transfer coefficient (W/m2 K) | |
| = | Thermal conductivity (W/m K) | |
| = | Length of air passage (m) | |
| = | Mass flow rate of air (kg/s) | |
| = | Number of thermocouples | |
| = | Nusselt Number | |
| = | Nusselt number for obstacle wall | |
| = | Nusselt number for smooth wall | |
| = | Air pressure (Pa) | |
| = | Pressure drop across the orifice (Pa) | |
| = | Pressure drop across the test section (Pa) | |
| = | Heat transfer from heated wall to the flowing air (W) | |
| = | Reynolds number | |
| = | Specific gas constant for dry air (287.05 J/kg K) | |
| SAH | = | Solar air heater |
| = | Bulk mean temperature of air at inlet (K) | |
| = | Bulk mean temperature of air at outlet (K) | |
| = | Plate temperature of air (K) | |
| = | Standard air temperature (K) | |
| = | Velocity of air (m/s) | |
| = | Width of air passage (m) | |
| = | X-axis direction pitch of inside conical ring (m) | |
| = | Relative X-axis pitch of inside conical ring | |
| = | X-axis pitch distance between impingement round jets (m) | |
| = | Relative X-axis jet distance | |
| = | Y-axis direction pitch of inside conical ring (m) | |
| = | Relative Y-axis pitch of inside conical ring | |
| = | Y-axis pitch distance between impingement round jetss (m) | |
| = | Relative Y-axis jet distance | |
| = | Jet to target plate spacing (m) |
Greek symbols
| = | Ratio of orifice meter to pipe diameter (dimensionless) | |
| = | Thermo-hydraulic performance (dimensionless) | |
| = | Density measurement of air (kg/m3) | |
| = | Dynamic viscosity of air (kg/m.s) | |
| = | Kinematic viscosity of air (m2/s) |
Subscripts
| ap | = | Heated wall |
| ar | = | air |
| FA | = | Flow rate of air |
| H | = | Hydraulic |
| IJ | = | Impingement round jets |
| imp | = | Impingement |
| in | = | In |
| OM | = | Orifice meter |
| OP | = | Orifice to pipe |
| OS | = | Obstacle wall |
| out | = | Out |
| p | = | plate |
| per | = | performance |
| R | = | Ring or obstacle |
| sa | = | Standard air |
| SS | = | Smooth wall |