Thermal performance and pressure drop of different pin-fin geometries

Abstract

The purpose of this study is to show the performance of hexagonal, square and cylindrical pin-fin arrays in improving heat transfer. In the present study, the thermal performance and pressure drop of the pin-fin heat exchanger are studied. The heat exchanger consists of cylindrical, hexagonal and square pin-fins. These types of pin-fins are capable of producing beneficial effects in transport enhancement and flow control. The pin-fins were arranged in an in-line manner. The relative longitudinal pitch SL/D=2 , and the relative transverse pitch were kept constant ST/D=2 . Air and water are used as working fluids in shell side and tube side, respectively. The inlet temperatures of air are between 50 and 90° C. The cold water entering the heat exchanger at the inner channel flows across the fin and flows out at the inner channel. Such pin-fins show potential for enhancing the heat transfer rate in pin-fin cross flow heat exchangers

Keywords

• Thermal performance,Pressure drop,Cylindrical,Hexagonal and square ins

References

1. 1. Jeng TM, Tzeng SC. Pressure drop and heat transfer of square pin–fin arrays in in-line and staggered arrangements. International Journal of Heat and Mass Transfer 50 (2007) 2364-2375.
2. 2. Vanfossen GJ. Heat transfer coefficients for staggered arrays of short pin–fins. Transactions of ASME, Journal of Heat Transfer 104 (1982) 268–274.
3. 3. Grannis VB, Sparrow EM. Numerical simulation of fluid flow through an array of diamond-shaped pin fins. Numerical Heat Transfer Applications (Part A). 19 (1991) 381–403.
4. 4. Yang KS, Chu WH, Chen IY, Wang CC. A comparative study of the airside performance of heat sinks having pin fin configurations. International Journal of Heat and Mass Transfer 50 (2007) 661–4667.
5. 5. Sparrow EM, Larson ED. Heat transfer from pin-fins situated in an oncoming longitudinal flow which turns to cross-flow. International Journal of Heat and Mass Transfer 25 (1982) 603-614.
6. 6. Yakut K, Alemdaroglu N, Kotcioglu I, Celik C. Experimental investigation of thermal resistance of a heat sink with hexagonal fins. Applied Thermal Engineering 26 (2006) 2262-2271.
7. 7. Chen Z, Li Q, Meier D, Warnecke HJ. Convective heat transfer and pressure loss in rectangular ducts with drop-shaped pin fins. Heat and Mass Transfer 33 (1997) 219-224.
8. 8. Ricci R, Montelpare S. An experimental IR thermographic method for the evaluation of the heat transfer coefficient of liquid-cooled short pin fins arranged in line. Experimental Thermal and Fluid Science 30 (2006) 381–391.

9. 9. Won SY, Mahmood GI, Ligrani PM., Spatially-resolved heat transfer and flow structure in a rectangular channel with pin fins. International Journal of Heat and Mass Transfer 47 (2004) 1731-1743.
10. 10. Hwang JJ, Lu CC. Lateral-flow effect on end wall heat transfer and pressure drop in a pin-fin trapezoidal duct of various pin shapes. ASME Paper No. 2000-GT-232, 2000.
11. 11. Wang CC, Lo J, Lin YT, Wie CS. Flow visualization of annular and delta winglet vortex generators in fin-and-tube heat exchanger application. International Journal of Heat and Mass Transfer 45 (2002) 3803-3815.
12. 12. Kotcioglu I, Caliskan S, Baskaya S. Experimental study on the heat transfer and pressure drop of a cross-flow heat exchanger with different pin–fin arrays. Heat and Mass Transfer 47 (2011) 1133–1142.
13. 13. Tahat MA, Babus’Haq RF, Probert SD. Forced steady-state convections from pin–fin arrays. Applied Energy 48 (1994) 335-351.
14. 14. El-Sayed SA, Mohamed MS, Abdel-latif AM, Abouda AE. Investigation of turbulent heat transfer and fluid flow in longitudinal rectangular-fin arrays of different geometries and shrouded fin array. Experimental Thermal and Fluid Science 26 (2002) 879-900.
15. 15. Chen TY, Shu TH. Flow structures and heat-transfer characteristics in fan flows with and without delta-wing vortex generators. Experimental Thermal and Fluid Science 28 (2003) 273-282.
16. 16. Jubran BA, Al-Salaymeh AS. Heat-transfer enhancement in electronic modules using ribs and ‘‘film cooling-like’’ techniques. International Journal of Heat and Fluid Flow 17 (1996) 148–154.
17. 17. Kline SJ, McClinctock FA. Describing uncertainties in singlesample experiments. Mechanical Engineering 75 (1953) 3–8