Evaluation of the thermal performance of hybrid nanofluids in pulsating heat pipe

Muhammad Zufar, Prem Gunnasegaran, Khai Ching Ng, Hemantkumar B. Mehta

Research output: Contribution to journalArticle

Abstract

The present article performed experimental and numerical investigations to evaluate the thermal performance of hybrid nanofluids in PHP under heat input and filling ratio of 10 W – 100 W and 50 %-60 %, respectively. The thermal performance results of PHP incorporated with hybrid nanofluids were compared with water. Water has low thermal conductivity value which is not favourable for an efficient heat transfer in a cooling device. Several studies have shown that hybrid nanofluid as a promising working fluid for thermal performance enhancement of the heat transfer device. The present study uses Al2O3-CuO hybrid nanofluid and SiO2-CuO hybrid nanofluid with mass concentration of 0.1 %. The thermal performance of PHP was studied with respect to the start-up mechanism, steady-state evaporator temperature, thermal resistance and the formation of two-phase flow. From the experiment results, PHP filled with SiO2-CuO hybrid nanofluid obtained the lowest thermal resistance value of 0.27 °C/W. Thermal resistance was improved by 55 % when PHP was charged with SiO2-CuO hybrid nanofluid compared to water. The optimal filling ratio of PHP is found to be 60 % at all the heat input and working fluid tested. Incorporating hybrid nanofluids in PHP have seen to expedite the start-up mechanism and also showed lower steady-state evaporator temperature and thermal resistance values.

Original languageEnglish
Pages (from-to)13-24
Number of pages12
JournalCFD Letters
Volume11
Issue number11
Publication statusPublished - 01 Jan 2019

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Fluid Flow and Transfer Processes

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