Experimental study on the thermal performance of a closed loop pulsating heat pipe with two different inserts

Abstract

Thermal control is crucial for managing small electrical and electronic equipment. The most effective method for thermal management is becoming recognized as a closed-loop pulsing heat pipe (CLPHP). This experimental investigation aim is to find a CLPHP to compare the thermal performance of CLPHP with two (copper and aluminum) different wire inserts. This experiment uses ethanol, methanol, distilled water and acetone as working fluids. The impact of employing pure water, methanol, ethanol and acetone as working fluids is investigated in various filling ratios. A copper capillary tube with an inner diameter of 2.75 mm, has been attached. The CLPHP contains six loops, each measuring 50 mm in length for the evaporation, 100 mm adiabatic, and 60 mm condensation sections. They were inserting Copper 0.9 mm wire and Aluminum 0.9 mm wire. The experiment was conducted with Filling Ratio ranging from 40% to 60% and heat input varied between 10 to 60 watts. The findings are compared based on evaporator temperature, condenser temperature, their differences, thermal resistance, heat transfer coefficient, power input, and the impact of filling ratios. The ideal filling ratios for ethanol, Methanol, distilled water and acetone are 60%, 40%, 40% and 40%, respectively, in Copper and Aluminum wire inserts. High boiling fluid, i.e., distilled water and ethanol copper wire insert, works as optimal performance. In comparison, comparatively low boiling points fluid such as methanol and acetone aluminum wire insert deliverers most remarkable performance