Analysis of Heat Transfer in Single-Phase Flow in Circular Mini-Channels

Year 2024, Volume: 8 Issue: 2, 50 - 60, 15.12.2024

Şendoğan Karagöz , Orhan Yıldırım

Abstract

Due to the increase in heat transfer and the increase in the amount of heat that needs to be removed from the unit area as a result of the reduction in size, this energy needs to be removed. In this study, the effects on heat transfer and friction factor of two circular mini channels with different hydraulic diameters on 6 different flow rates were investigated. Pure water was used as the working fluid and tested at Reynolds numbers ranging from 6000-14000. The experimental results were analyzed and validated using CFD. The Nusselt number and friction factor are analyzed for the results and empirical correlations are proposed. The predictions of heat transfer correlations in mini-channels and classical heat transfer correlations are compared with the experimental results and a high agreement is observed. For the 2.74 mm diameter pipe, the minimum andmaximum Nu increase rates compared to 2.26 mm were 30.22% for Re=10724 and 38.33% for Re=13678, respectively. For the 2.26 mm diameter pipe compared to 2.74 mm, the minimum and maximum f increase rates were 31.95% for Re=13678 and 43.10% for Re=10724, respectively. It was found that the reason for the deviation caused by the numerical and experimental results, which are in agreement, is the mismatch in the physical mechanisms affecting the heat and flow transfer.

Keywords

MEMS, Pressure Drop, Circular Minichannel, Single-phaseHeat Transfer

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