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Title: An experimental investigation of structured roughness on heat transfer during single-phase liquid flow at microscale
Authors: Lin, TY
Kandlikar, SG
3rd Micro and Nano Flows Conference (MNF2011)
Keywords: Roughness;Microscale heat transfer;Structured roughness;Minichannels
Issue Date: 2011
Publisher: Brunel University
Citation: 3rd Micro and Nano Flows Conference, Thessaloniki, Greece, 22-24 August 2011
Abstract: The effect of structured roughness on the heat transfer of water flowing through minichannels was experimentally investigated in this study. The test channels were formed by two stainless steel plates, 4 mm thick, 12.7 mm tall, and 94.6 mm in length. The surfaces of the plates forming the channel walls were machined with structured roughness elements with height ranging from 18 μm to 96 μm, and pitch ranging from 250 μm to 400 μm. The hydraulic diameter of the channels range from 0.71 mm to 1.87 mm. After accounting for the heat loss from the edges and end sections, the heat transfer coefficient for smooth channels was calculated. The coefficient was found to be in good agreement with the conventional correlations in the laminar entry region and laminar fully developed region. Convective heat transfer was found to be enhanced by the roughness. In the ranges of tested parameters, the roughness element pitch was found to have almost no effect, while the heat transfer coefficient was significantly enhanced by increasing the roughness element height. An earlier transition from laminar to turbulent flow was observed with increasing relative roughness. Comparing with inserts, the highest relative roughness element provided the highest thermal performance factor in the Reynolds number in the range from about 400 to 2800.
Description: This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.
ISBN: 978-1-902316-98-7
Appears in Collections:Brunel Institute for Bioengineering (BIB)
The Brunel Collection

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