Effect of the Inclination Angle on the Steady-State Heat Transfer Performance of a Thermosyphon

Abstract

A two-phase closed thermosyphon is an efficient heat transfer element. The heat transfer process of this type of thermosyphon includes conduction and convective heat transfer accompanied by phase changes. Variations in the inclination angle of a thermosyphon affect the steady-state heat transfer performance of the device. Therefore, the inclination angle is an important factor affecting the performance of a thermosyphon. In this paper, an equation for the actual heating area variations with respect to the inclination angle is deduced, and a model for the areal thermal resistance of a thermosyphon is proposed by analyzing the main influence mechanisms of the inclination angle on the heat transfer process. The experimental results show that the areal thermal resistance, which accounts for the effect of the actual heating area, does not change with respect to the inclination angle and exhibits a linear relationship with the heat transfer rate. The thermal resistance equation is fit according to the experimental data when the inclination angle of the thermosyphon is vertically oriented (90 • ), and the predicted values of the thermosyphon's thermal resistance are obtained when the thermosyphon is inclined. The deviations between the experimental data and predicted values are less than ±0.05. Therefore, the theoretical equation can accurately predict the thermosyphon's thermal resistance at different inclination angles.

Effect of inclination angle on the thermal-hydraulic characteristics and entropy generation of Al2O3–water nanofluid for in-tube turbulent flow

“…Increased Reynolds number and volume concentration cause an increase in the inertia and intercollision forces and the Brownian motion of the nanoparticles in the base fluid leading to higher thermal conductivity and hence higher heat transfer coefficient. Increased volume concentration leads to a reduced thermal boundary layer and increased axial condition, which results in reduced thermal resistance (Sasmal, 2018; Wu et al , 2019). The nanofluids show an improvement in thermal performance compared with the base fluid.…”