Design optimization of gap distance for the capillary limitation of a heat pipe with annular-type wick structure

Seo, Joseph; Kim, Daegeun; Kim, Hansol; Hassan, Yassin A.

doi:10.1063/5.0094561

Design optimization of gap distance for the capillary limitation of a heat pipe with annular-type wick structure

Journal Article · Tue Jun 14 00:00:00 EDT 2022 · Physics of Fluids

DOI:https://doi.org/10.1063/5.0094561· OSTI ID:1979096

^[1]; Kim, Daegeun ^[2]; Kim, Hansol ^[2]; Hassan, Yassin A. ^[2]

Texas A & M University, College Station, TX (United States); OSTI
Texas A & M University, College Station, TX (United States)

In this study, an experimental investigation was conducted on the rising height and contact angle of fluid in an annular wick-type heat pipe. The annular wick-type heat pipe was characterized by a small gap between the wick structure and tube wall, which compensated for the pressure drop along the porous media and created additional capillary force. To describe and model the advantage of this gap, the rising of a wetting liquid in the gap between a vertical solid plate and a mesh (with a small angle between them) was experimentally measured and analyzed. An additional experiment was performed to investigate the effect of curvature on the capillary rise using tubes and meshes of varying radii. Resultantly, we confirmed that the linear combination of the contact angles of the solid plate and mesh could be applied to calculate the rising height from the Laplace–Young equation. Furthermore, the effect of curvature on the rising height of the liquid was negligible. These results were extended to the investigation of finding the optimal gap distance for the annular wick-type heat pipe by referring to previous studies. We observed that a gap distance of 1.27 mm provided the largest permeability (K) over the effective pore radius (r_eff) value for a heat pipe with ethanol, which in turn resulted in the highest capillary limitation. For a sodium heat pipe, a gap distance of 0.84 mm resulted in the highest capillary limitation.

View Accepted Manuscript (DOE)

Research Organization:: Texas A & M University, College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NE0008970

OSTI ID:: 1979096

Journal Information:: Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 6 Vol. 34; ISSN 1070-6631

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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