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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2013006540
pages 153-163

EXPERIMENTAL STUDY ON THERMAL PERFORMANCE OF PULSATING HEAT PIPE WITH Al2O3-DEIONIZEDWATER NANOFLUID AT DIFFERENT ORIENTATIONS

Bhawna Verma
Department of Chemical Engineering, I.I.T. (B.H.U.) Varanasi 221005, U.P., India
V. L. Yadav
Department of Chemical Engineering, I.I.T. (B.H.U.) Varanasi 221005, U.P., India
K. K. Srivastava
Department of Chemical Engineering, I.I.T. (B.H.U.) Varanasi 221005, U.P., India

SINOPSIS

Thermal resistance as a function of heat load and start-up temperature with respect to time have been investigated for a pulsating heat pipe (PHP) at different inclination angles. PHP was made of 1.45 mm inner diameter copper tubes having 6 turns. Al2O3 nanofluid (concentration 0.25%, 0.5, 1.0, 1.25, 1.5, and 2.5% by wt.) with particle size 45 nm at an optimum filling ratio of 50% was used. It is found that as the concentration increases from 0.25% to 1.0% there is considerable decrease in thermal resistance as compared to that of the base fluid but as the concentration increases from 1.25% to 2.5% the thermal performance deteriorates. Optimum concentration of nanoparticles was 1.0% by wt. in base fluid with respect to start-up and thermal resistance for PHP in vertical orientation and 45° inclination, while in horizontal orientation 0.5% by wt. concentration showed the best results. Maximum decrease in thermal resistance with respect to deionized (DI) water was observed at 50Wfor 1.0% nanofluid concentration by wt. at 45° inclination, which was 33.6%. Heat transfer coefficients at evaporator and condenser are also investigated at vertical mode of operation.


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