Abstract
In the present study, a new tapering heat pipe design had been developed to enhance the thermal performances. Boiling visualization in the tapering heat pipe is investigated to provide the detailed information of bubbles nucleation. Experiment was conducted in the tapering heat pipe with variation of the evaporator (d) to condenser (D) diameter ratio. The values of d/D are varied at 1/1; 1/2; 1/3 and 1/4. Heat load was generated at the evaporator section using heater DC-Power supply at 30, 40 and 50 Watt. The visualization technique was developed by using a transparent glass tube and the images of boiling bubbles were captured by SLR camera. The glass tube inclination is 45o and integrated with the NI-9211 and c-DAQ 9271 module. K-type thermocouple was set at the evaporator and condenser sections for measurement of boiling temperatures in the tapering heat pipe. Based on the results, it can be noted that variations of heat load and diameter ratio (d/D) of the evaporator and condenser affect the size and shape of boiling bubbles, as well as the nucleation temperature on the tapering heat pipe. The heat transfer coefficient tends to increase at a heat load of 50 W and diameter ratio d/D=1/4.
Highlights
Heat pipe is a technology that uses porous media in the form of wick, which serves as a path for the return of liquid fluid from the condenser to the evaporator
The structure, design and construction of wick had a strong influence on heat pipe performance and had a critical aspect in the manufacturing process
The visualization experiment result shows the evaporator to condenser diameter ratio and heat load effect on the boiling phenomenon as follows: 1. The bubbles shape and size are variation generated at various heat loads and variation of evaporator to condenser diameter ratio
Summary
Heat pipe is a technology that uses porous media in the form of wick, which serves as a path for the return of liquid fluid from the condenser to the evaporator. The basic principle Heat pipe uses two-phase flow, latent heat and capillary channel for working fluid circulation between heating and cooling areas with wick media. The structure, design and construction of wick had a strong influence on heat pipe performance and had a critical aspect in the manufacturing process. Various heat pipe design features had been developed to enhance the thermal performances. While the thermal performance of heat pipe challenges is well understood, the research was focused on boiling visualization to provide the phenomenon of nucleation form. Heat pipe with variation of the evaporator to condenser diameter ratio through visualization. To accomplish the set aim, the following tasks were set: – to find the shape and size of the bubbles phenomenon at various heat loads and variation of the evaporator to condenser diameter ratio; – to find the heat transfer coefficient and thermal resistance at various heat loads and variation of the evaporator to condenser diameter ratio
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