Research Papers

Heat Transfer at Aluminum–Water Interfaces: Effect of Surface Roughness

[+] Author and Article Information
H. Sam Huang

e-mail: hsengji.huang.ctr@wpafb.af.mil

Jennifer L. Wohlwend

Thermal Sciences and Materials Branch,
Materials and Manufacturing Directorate,
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433;
Universal Technology Corporation,
1270 North Fairfield Road,
Dayton, OH 45432

Ajit K. Roy

Thermal Sciences and Materials Branch,
Materials and Manufacturing Directorate,
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433

Manuscript received April 17, 2012; final manuscript received August 3, 2012; published online January 18, 2013. Assoc. Editor: Debjyoti Banerjee.

J. Nanotechnol. Eng. Med 3(3), 031008 (Jan 18, 2013) (6 pages) doi:10.1115/1.4007584 History: Received April 17, 2012; Revised August 03, 2012

In this paper, we studied the effect of microscopic surface roughness on heat transfer between aluminum and water by molecular dynamic (MD) simulations and macroscopic surface roughness on heat transfer between aluminum and water by finite element (FE) method. It was observed that as the microscopic scale surface roughness increases, the thermal boundary conductance increases. At the macroscopic scale, different degrees of surface roughness were studied by finite element method. The heat transfer was observed to enhance as the surface roughness increases. Based on the studies of thermal boundary conductance as a function of system size at the molecular level, a procedure was proposed to obtain the thermal boundary conductance at the mesoscopic scale. The thermal boundary resistance at the microscopic scale obtained by MD simulations and the thermal boundary resistance at the mesoscopic scale obtained by the extrapolation procedure can be included and implemented at the interfacial elements in the finite element method at the macroscopic scale. This provides us a useful model, in which different scales of surface roughness can be included, for heat transfer analysis.

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Fig. 1

Aluminum blocks and water blocks for nonequilibrium MD simulations

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Fig. 2

Schematics of DSR

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Fig. 3

Temperature profile of system 1 at steady state

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Fig. 4

Thermal boundary conductance against DSR

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Fig. 5

Thermal resistance against reciprocal of the system size for the extraction of mesoscale thermal conductance

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Fig. 6

Meshes of five systems used to study the effects of surface roughness at the macroscopic scale

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Fig. 7

Temperature contours of the five systems

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Fig. 8

Heat flux contours of five systems

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Fig. 9

Thermal boundary resistance against (reciprocal of system size and DSR)




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