Heat transfer analysis and evaluation for two-phase flow in porous-channel heat sinks /
Presented here are the results of a heat transfer analysis and measurement for two-phase heat dissipation by utilizing a high-conductivity porous channel as a heat sink. Sintered copper beads were chosen as the porous media. Heat was imposed at the bottom surface of the channel to simulate the con...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739667351&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Presented here are the results of a heat transfer analysis and measurement for two-phase heat dissipation by utilizing a high-conductivity porous channel as a heat sink. Sintered copper beads were chosen as the porous media. Heat was imposed at the bottom surface of the channel to simulate the constant heat flux condition of an electronic device and the top surface was insulated. Subcooled water was chosen as the working fluid. In the analysis, Darcy's law is applied for both liquid and vapor phases and non-local-thermodynamic equilibrium between the solid and fluid is employed. For computational simplicity, a consistent set of conservation equations for mass, momentum and energy, along with boundary conditions, which are valid throughout the entire domain are derived based on phase-averaged properties of the fluid. The resulting two-dimensional conservation equations are discretized by the finite volume method and solved numerically. In the experimental investigation, heat transfer performance of several heat sink test articles fabricated from sintered copper beads in copper channels were evaluated. Test conditions ranged from 10-25 W/cm2 for heat flux, 15-150 ml/min for flow rate, 1.062-1.252 bar for inlet pressure and 30-95 'C for inlet temperature of water, respectively. The experimental results show good agreement with the numerical predictions. The results indicate that the high conductivity and large solid-fluid contact area of the porous channel result in higher heat transfer coefficients compared to that for an empty channel. In addition, the temperature on the heated surface was shown to remain quite uniform. Overall, the results confirm the expectation that the use of two-phase heat dissipation in high conductivity porous channels may be an acceptable cooling technique for future electronic devices where high heat fluxes must be removed. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xvii, 183 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 129-131. |