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Experimental Investigation of Heat Pipe with Annular Fins under Natural Convection at Different Inclinations

Authors: Gangacharyulu Dasaroju, Sumeet Sharma, Sanjay Singh


Heat pipe is characterised as superconductor of heat because of its excellent heat removal ability. The operation of several engineering system results in generation of heat. This may cause several overheating problems and lead to failure of the systems. To overcome this problem and to achieve desired rate of heat dissipation, there is need to study the performance of heat pipe with annular fins under free convection at different inclinations. This study demonstrates the effect of different mass flow rate of hot fluid into evaporator section on the condenser side heat transfer coefficient with annular fins under natural convection at different inclinations. In this study annular fins are used for the experimental work having dimensions of length of fin, thickness of fin and spacing of fin as 10 mm, 1 mm and 6 mm, respectively. The main aim of present study is to discover at what inclination angles the maximum heat transfer coefficient shall be achieved. The heat transfer coefficient on the external surface of heat pipe condenser section is determined by experimental method and then predicted by empirical correlations. The results obtained from experimental and Churchill and Chu relation for laminar are in fair agreement with not more than 22% deviation. It is elucidated the maximum heat transfer coefficient of 31.2 W/(m2-K) at 25˚ tilt angle and minimal condenser heat transfer coefficient of 26.4 W/(m2-K) is seen at 45˚ tilt angle and 200 ml/min mass flow rate. Inclination angle also affects the thermal performance of heat pipe. Beyond 25o inclination, heat transport rate starts to decrease.

Keywords: Annular fins, condenser heat transfer coefficient, heat pipe, natural convection, tilt angle.

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[1] Gaugler, R., 1944, "Heat Transfer Device," U.S. Patent No. 2350348.
[2] Grover, G.M., 1966. Evaporation-condensation heat transfer device. U.S. Patent 3,229,759.
[3] Dunn, P.D. and Reay, D., 2012. Heat pipes. Elsevier.
[4] Chi, S.W., 1976. Heat pipe theory and practice: a sourcebook.
[5] Kang, H.S., 2009. Optimization of a rectangular profile annular fin based on fixed fin height. Journal of mechanical science and technology, 23(11), pp.3124-3131.
[6] Senapati, J.R., Dash, S.K. and Roy, S., 2016. Numerical investigation of natural convection heat transfer over annular finned horizontal cylinder. International Journal of Heat and Mass Transfer, 96, pp.330-345.
[7] Yildiz, Ş. and Yüncü, H., 2004. An experimental investigation on performance of annular fins on a horizontal cylinder in free convection heat transfer. Heat and mass transfer, 40(3-4), pp.239-251.
[8] Yadav, R.K. and Basak, R., 2017, August. Review on Heat Transfer from Fins. In IOP Conference Series: Materials Science and Engineering (Vol. 225, No. 1, p. 012145). IOP Publishing.
[9] Rao, J. Koteswara, Ahamed, MD.Mansoor, Raju, S., Srikumar, V. and Sairam, N.V. Experimental investigation oh heat transfer through rectangular and trapezoidal fins made of aluminium 6063 alloy. International research journal of engineering and technology, 7(4).
[10] Vikas Kumar , D. Gangacharyulu & Ram Gopal Tathgir (2007) Heat Transfer Studies of a Heat Pipe, Heat Transfer Engineering, 28:11, 954-965.
[11] Senthilkumar, R., Vaidyanathan, S. and Sivaraman, B., 2011. Performance investigation of heat pipe using aqueous solution of n-Pentanol with different inclinations. Journal of mechanical science and technology, 25(4), pp.923-929.
[12] Tathgir, R. G., Kumar, A., and Gangacharyulu, D., Performance Characteristics of a Carbon Steel Heat Pipe at Low Temperature Range, 11th Int. Heat Pipe Conference, Tokyo, Japan, vol. 2, pp. 26–31, 1999.