Start-up Characteristics of Swallow-tailed Axial-grooved Heat Pipe under the conditions of Multiple Heat Sources

• Published in: IOP conference series. Earth and environmental science 2017-12, Vol.100 (1), p.12019
• Main Author: Zhang, Renping
• Format: Article
• Language: English
• Subjects: Capacitance; Evaporation; Evaporators; Flow rates; Heat; Heat pipes; Heat sources; Heat transfer; Mass flow rate; Mathematical models; Shear stress; Velocity; Wall temperature
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/100/1/012019

A mathematical model was developed for predicting start-up characteristics of Swallow-tailed Axial-grooved Heat Pipe under the conditions of Multiple Heat Sources. The effects of heat capacitance of heat source, liquid-vapour interfacial evaporation-condensation heat transfer, shear stress at the interface was considered in current model. The interfacial evaporating mass flow rate is based on the kinetic analysis. Time variations of evaporating mass rate, wall temperature and liquid velocity are studied from the start-up to steady state. The calculated results show that wall temperature demonstrates step transition at the junction between the heat source and non-existent heat source on the evaporator. The liquid velocity changes drastically at the evaporator section, however, it has slight variation at the evaporator section without heat source. When the effect of heat source is ignored, the numerical temperature demonstrates a quicker response. With the consideration of capacitance of the heat source, the data obtained from the proposed model agree well with the experimental results.