[[The]] constrained vapor bubble heat pipe experiment: understanding the role of interfacial flow

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Authors
Kundan, Akshay
Issue Date
2016-08
Type
Electronic thesis
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ENG
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Chemical engineering
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Abstract
The performance of a heat pipe is affected by various limits and capillary limit being one of them. This limit has been previously studied in detail and the transport equations describing it are well established. Interfacial forces can play a major role in the performance of a heat pipe in the absence of gravity. Interfacial forces such as Marangoni forces can drive the liquid from the heater end to the cooler end, reducing the effectiveness of the heat pipe by literally drying out the hot end, and this is known as the Dryout limitation. The transparent setup of the CVB shows that the increasing power input leads to the formation of a thick coating layer near the heater end. This is opposite to what is predicted from the literature. This phenomena is observed in both 30 mm and 40 mm CVB modules. An additional phenomenon is observed in the 40 mm module which shows that this limitation region stops growing down the axial position of the heat pipe at high power inputs because of the inability of Marangoni flow to further offset the capillary flow. Also, fringes are observed in the 40 mm CVB module near the heater end which looks like the formation of a jet on the flat surface of the cuvette near the heater end.
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August 2016
School of Engineering
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Rensselaer Polytechnic Institute, Troy, NY
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