Two-phase flows in an oscillating heat pipe (OHP) charged with deionized (DI) water and a nanofluid (0.268% v/v) were experimentally investigated. The OHP was made of quartz glass tube (with an inner diameter of 3.53 mm and an outer diameter of 5.38 mm) and coated with a transparent heating film in its evaporating section. The internal two-phase flows at different heat loads were recorded by a charge-coupled device (CCD) camera. Only column flow was observed in the DI water OHP while in the nanofluid OHP the flow first was column, then slug and annular flows as the heat load was steadily increased. Heat transfer in the OHP was strongly related to the two-phase regime. The flow regime transitions effectively increased the operating allowable heat loads in the nanofluid OHP two- to threefold relative to the DI water OHP. The nanofluid OHP had a much lower thermal resistance than the DI water OHP with the most effective heat transfer in the nanofluid OHP occurring in the slug flow regime.
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Research Papers
Visualization of Two-Phase Flows in Nanofluid Oscillating Heat Pipes
Qi-Ming Li,
Qi-Ming Li
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
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Jiang Zou,
Jiang Zou
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
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Zhen Yang,
Zhen Yang
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
e-mail: yangzhen.athu@gmail.com
Tsinghua University
, Beijing 100084, China
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Yuan-Yuan Duan,
Yuan-Yuan Duan
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
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Bu-Xuan Wang
Bu-Xuan Wang
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
Search for other works by this author on:
Qi-Ming Li
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
Jiang Zou
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
Zhen Yang
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, Chinae-mail: yangzhen.athu@gmail.com
Yuan-Yuan Duan
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, China
Bu-Xuan Wang
Laboratory of Phase Change and Interfacial Transport Phenomena, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,
Tsinghua University
, Beijing 100084, ChinaJ. Heat Transfer. May 2011, 133(5): 052901 (5 pages)
Published Online: February 2, 2011
Article history
Received:
December 23, 2009
Revised:
October 26, 2010
Online:
February 2, 2011
Published:
February 2, 2011
Citation
Li, Q., Zou, J., Yang, Z., Duan, Y., and Wang, B. (February 2, 2011). "Visualization of Two-Phase Flows in Nanofluid Oscillating Heat Pipes." ASME. J. Heat Transfer. May 2011; 133(5): 052901. https://doi.org/10.1115/1.4003043
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