Experimental Investigation of Aluminum Oxide Nanofluid on Closed Loop Pulsating Heat Pipe Performance

Abstract

This paper discusses the experimental studies performed on a single closed loop pulsating heat pipe (CLPHP) to evaluate its thermal performance. The pulsating heat pipe is brass which has a single closed loop. Aluminium oxide (Al2O3) and deionized (DI) water nanofluid were utilized as working fluids, with different volume concentrations of aluminium oxide nanoparticles of 0.05 %, 0.5 % and 1%. The aluminium oxide particles are mixed with water in the two-step method to produce a stable suspension. Experiments are carried out in the horizontal mode with watt loads of heat inputs ranging from 10 w to 100 w. The temperature differences between the evaporator and condenser portions, thermal resistance, heat transfer coefficient and thermal conductivity are the parameters used to determine thermal performance. The thermal resistance of aluminium oxide and DI water nanofluid was the lowest, having 48 % less than that of water. The effective thermal conductivity of the heat pipe improves as the concentration of nanoparticles increases. The comparison between experimental results and computational fluid dynamics (CFD) simulation results CLPHP was carried out under the same condition.

Experimental Investigation for Enhancement of Heat Transfer Coefficient in Car Radiator by Using Multiwall Carbon Nanotube (MWCNT) Nanofluid

“…According to previous research [17], it has been observed that multi-walled carbon nanotubes exhibit superior thermal resistance in comparison to aluminium oxide/ copper oxide/ water nanofluids. The experimental thermal characteristics of multi-walled carbon nanotubes have been shown to significantly improve heat transmission, as indicate by many studies [18]- [22]. Sadri et al [23] formulated a multi-walled carbon nanotube nanofluid using 0.1 wt.…”

Radial basis Neural Network Model to Prediction of Thermal Resistance and Heat Transfer Coefficient of Oscillating Heat Pipe Using Graphene and Acetone-Based Nanofluids

“…Apart from all these performance methods of Close loop pulsating heat pipe (CLPHP) can also be evaluated using Al2O3 and deionized as a nanofluid to measure the performance of working fluids. Based on the observations thermal resistance was measured around 48% less than that of water [27]. In some cases, numerical methods have been introduced to predate the oscillatory movement of the fluids.…”

FMECA and FTA analysis applied to the manufacturing process of pulsating heat pipes

“…The idea behind having a working fluid under vacuum conditions is to achieve a balance between a vapor phase and a liquid phase under lower saturation conditions compared to atmospheric pressure. These devices offer a significant advantage due to their straightforward manufacturing process and their ability to transfer high heat fluxes [1]. The primary role of a PHP is to transfer high heat fluxes to maintain the operating temperature within a specific range, which depends on the internal pressure of the tube.…”