Effect of inclination angle on the heat transfer performance of a three-phase closed thermosyphon

Abstract A three-phase (V/L/S) closed thermosyphon (THPCT) with variable inclination angles is developed and assembled in this study. The effect of inclination angle (0°~30°), particle type and heating power (100~300 W) on the thermal performance of the THPCT is investigated by using water as the liquid working medium, and silicon carbide (SiC) particle, polyformaldehyde (POM) particle and glass bead as the solid working media, respectively. Results show that both SiC and POM particles can obviously improve the thermal performance of the thermosyphon at the four inclination angles, and the maximum overall thermal resistance reduction rate are 25.7% and 39.4% respectively, at Q=100 W and θ=30°; however, the glass beads deteriorate the heat transfer performance of the thermosyphon. The overall thermal resistances of both TPCT and THPCT fluctuate with the increase in inclination angle, and decrease with the increase in heating power, but the decreasing degree becomes smaller and smaller. The convective heat transfer coefficients of both the evaporation section and condensation section also fluctuate with the increase in inclination angle. The heat transfer of the condensation section varying with heating power is more significant compared with the evaporation section. In most cases, SiC or POM particles can improve the heat transfer of the evaporation section and condensation section; the glass beads can greatly improve the heat transfer of the evaporation section, but generally deteriorate the heat transfer of the condensation section. The thermal resistance of the evaporation section is obviously smaller than that of the condensation section for both for the TPCT and THPCT. The ratio of the thermal resistance of the evaporation section to that of the condensation section decreases with the increase in heating power at four inclination angles, but the degree decreases. The thermal resistance ratio generally fluctuates with the increase in inclination angle, but the difference among different inclination angles decreases with the increase in heating power. The addition of the SiC particles and POM particles can reduce the thermal resistance ratio, while the addition of glass beads increases thermal resistance ratio. The 3D contour maps are drawn to reflect the overall thermal resistance varying with operating parameters.

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	JIANG Feng
	LIN Yiming
	MA Yuxin
	QI Guopeng
	LI Xiulun

Keywords： inclination angle particle type THPCT heat transfer process enhancement fluidized bed heat transfer

Received 2022-04-09;

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JIANG Feng, LIN Yiming, MA Yuxin, QI Guopeng, LI Xiulun.Effect of inclination angle on the heat transfer performance of a three-phase closed thermosyphon[J] Chemcial Industry and Engineering, 2023,V40(5): 64-75

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