Evaluation of the thermal performance of a heat pipe using alumina nanofluids

Experimental investigation on surface tension of metal oxide–water nanofluids

“…Further, the maximum heat transport of the heat 61 pipe is determined by the merit number (figure of merit), which is the 62 ratio of the product of the surface tension, the density, and the latent 63 heat of vaporization to the viscosity of the working fluids [21]. Further-64 more, nanofluids can reduce the thermal resistance as well as increases 65 the thermal performance of the heat pipes [22,23] …”

Thermal performance of inclined screen mesh heat pipes using silver nanofluids

“…Wang et al [27] Water/CuO 50 nm & 0.5-2.0 wt.% The inclination angle of 45°corresponds to the best thermal performance for heat pipes Hung et al [15] Water/Al 2 O 3 20 nm & 0.5-3.0 wt.% The tilt angle that maximizes the thermal performance of the heat pipe ranges from 40°to 70°T eng et al [28] Water/Al 2 O 3 20-30 nm & 0.5-3.0 wt.% The optimal thermal efficiency for heat pipes occurred at 60°L iu et al [29] Water/CuO 50 nm & 0.5-2.0 wt.% The inclination angle of 45°corresponds to the best thermal performance for heat pipes Senthilkumar et al [30] Water temperatures of the heat pipe surface were measured using five K-type thermocouples by mounting two thermocouples at the surface of the evaporator, one at the surface of the adiabatic section and the rest at the surface of the condenser section.…”

“…A novel idea which has been suggested is to utilize nanofluid as a working fluid in heat pipes to enhance heat pipes thermal efficiency. During recent years, researchers have concentrated mainly on investigation of nanofluids on heat pipe performance at different working conditions [9][10][11][12][13][14][15][16]. Different types of nanofluids such as water based copper, aluminum oxide and silver nanofluids have been used in the common types of heat pipes primarily include cylindrical heat pipes [17,18], oscillating heat pipes [19,20] thermosyphons [21] and pulsating heat pipes [22] and it has been shown that nanofluids can effectively improve the heat transfer performance of heat pipes.…”

Effect of magnetic field on the heat transfer rate of kerosene/Fe2O3 nanofluid in a copper oscillating heat pipe

“…The literature review shows that most of the studies on the heat transfer in the OHP considered experimental measurements yielded from the nanoparticles' effect [2,3]. Different types of nanoparticles, such as metal [4,5], diamond [6], gold [7] and oxide particles [8,9] have been tested to study their effects on the performance of heat pipes. Nano fluids enhance the hate transfer because (a) nanoparticles increase the thermal conductivity of the operating fluid, which eventually enhances the heat transfer efficiency of the heat pipe [10,11] and (b) as the temperature increases, the Brownian motion of nanoparticles increases, which improves the convective heat transfer of the fluid [12,13].…”