Open Access

ARTICLE

USE OF SILVER NANOPARTICLES MIXED WITH DEIONIZED WATER IN A RECTANGULAR TWO-PHASE CLOSED THERMOSYPHON: A CASE STUDY OF THE TWO-PHASE FLOW

by

a Department of Mechanical Engineering, Faculty of Industry and Technology, Rajamangala University of Technology Isan, Sakon Nakhon Campus, Sakon Nakhon 47160, Thailand
b Heat Pipe and Thermal Tool Design Research Unit (HTDR), Division of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, 44150, Thailand
c Birmingham Centre for Thermal Energy Storage, School of Chemical Engineering, University of Birmingham, UK
d Heat Pipe and Nanofluid Technology Research Unit, Faculty of Industrial Technology and Management, King Mongkut’s University of Technology North Bangkok, 25230, Thailand
* Corresponding author. Email: surachet.si@rmuti.ac.th

Frontiers in Heat and Mass Transfer 2022, 19, 1-9. https://doi.org/10.5098/hmt.19.24

Abstract

When nanofluid (NF) is used as the working fluid in a rectangular two-phase closed thermosyphon (RTPCT), the formations and heat performance of two-phase flow patterns are explored qualitatively. Silver nanoparticles were mixed with deionized water at a concentration of 0.5 wt% in the NF. Nanoparticles improved the thermal contact surface area within the base flow, allowing the base fluid to boil quickly and easily. When the working fluid was boiled, NF also demonstrated high thermal conductivity capabilities, which diffused and moved along with the dual flow patterns. As a result, these qualities improved the RTPCT's efficiency. Considering the findings of the RTPCT test at evaporation temperatures of 50, 70, and 90o C, three flow forms are observed: bubble flow (BF), slug flow (SF), and churn flow (CF), respectively. The slug flow (SF) and the churn flow (CF) are patterns that influence the heat flux. The greatest heat flow obtained from the test is 4.78 kW/m² at 90°C evaporation temperatures, whereas the heat flux measured at 70°C and 50°C evaporation temperatures is 2.95 kW/m² and 2.74 kW/m² , respectively.

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