Natural Convection Immersion Cooling of an Array of Heated Protrusions in an Enclosure Filled with Dielectric Liquid: Effects of Enclosure Width and Fluid Prandtl Number

Abstract

An experimental investigation of natural convection immersion cooling of an array (3 by 3 horizontally-placed heated discrete protrusions) in an enclosure filled with dielectric fluids has been conducted. Each rectangular protrusion simulates a 20 pin dual-inline-package. Effects of enclosure width and fluid Prandtl number were examined. Five different spacings from 42 mm to 7 mm and two dielectric fluids, FC-75 (Pr=25 at 27 C) and FC-43 (Pr=82 at 27 C) were used. The top boundary of the enclosure was kept constant at 10 C and the bottom boundary was insulated during the experiments. Power dissipation levels per component ranged from 0.115 W to 2.9 W. Component surface temperature measurements were used to obtain the nondimensional heat transfer parameters. In the case of FC-75 and 30 and 7 mm spacings, and in the case of FC-43 and 7 mm spacing, timewise fluctuations of temperature at steady state in several locations were recorded with increasing power level.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1991
Accession Number
ADA242702

Entities

People

  • Erol Aytar

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acquisition
  • Boundaries
  • Circuit Boards
  • Data Acquisition
  • Dissipation
  • Electronic Equipment
  • Heat Transfer
  • Heat Transfer Coefficients
  • Measurement
  • Plastic Explosives
  • Power Levels
  • Prandtl Number
  • Steady State
  • Surface Temperature
  • Thermal Conductivity
  • Thermophysical Properties
  • Three Dimensional

Readers

  • Combustion and Flow Dynamics.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems
  • Space
  • Space - Hall-Effect Thruster