Experimental study of partially flattened axial grooved heat pipes |
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Authors: | HanZhong Tao Hong Zhang Jun Zhuang Jerry W Bowmans |
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Institution: | (1) Energy School of Nanjing University of Technology, Nanjing, 210009, China;(2) Mechanical Engineering Department, Brigham Young University, Provo Utah, 84602, USA |
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Abstract: | This article made experimental study on mini-axial grooved heat pipes (AGHP) with 11 flattening forms. It analyzed how the
flattening form, flattening thickness and working temperature affect axial temperature distribution, thermal resistance, heat
transfer limit and the phase-change heat transfer coefficients in evaporator and condenser sections. The result indicates
that all forms of AGHPs can maintain good isothermal performance under normal operating condition. The geometric shape of
AGHP has obvious impact on heat transfer limit. With respect to an AGHP with 2 mm-thick evaporator section, when the thickness
of its condenser section increases from 2 to 3 mm, its heat transfer limit increases by 81%; with respect to an AGHP with
3 mm-thick evaporator section, when the thickness of its condenser section increases from 2 to 3 mm, its heat transfer limit
increases by 134%; with respect to an AGHP with 4 mm-thick condenser section, when the thickness of its evaporator section
increases from 2 to 3 mm, its heat transfer limit increases by 26%. When the thickness of the evaporator section increases
by 1 mm, the heat transfer limit will increase by 9%–26%, while when the thickness of the condenser section increases by 1
mm, the heat transfer limit will increase by 20%–86%. The thickness of the condenser section has greater impact on heat transfer
performance of an AGHP than the thickness of the evaporator section does. The study content of this article will help understand
the heat transfer performance of AGHP, and electronic thermal design process. |
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Keywords: | axial grooved heat pipe (AGHP) partial flattening experimental study |
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