Evaluation of the Effects of Roll Angle on the Natural Convection Heat Transfer from an Array of Cylindrical Spines.

Abstract

Electronically steered phased array antennae frequently exhibit degraded performance due to the lack of proper heat transfer between the interior crystalline materials and the environment. This causes higher than optimum temperature environments for the crystalline materials and a subsequent loss of reliability. One possible solution to such a problem considers a surface augmentation through the use of pin fins (or spines) to assist in the dissipation of the heat. Experimental data has been obtained that predicts the effect of roll angle upon the natural convection heat transfer from an array of cylindrical spines or pin fins. A correlation is presented that permits evaluation of the Nusselt Modulus as a function of the Rayleigh Modulus and the roll angle and it shows that maximum heat transfer is obtained at roll angles between 20 and 30 degrees. Keywords: Natural convection; Finned array; Roll angle enhancement. (Theses).

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1984
Accession Number
ADA154594

Entities

People

  • J. E. Mcclanahan

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Convection
  • Data Reduction
  • Electronic Equipment
  • Engineering
  • Equations
  • Experimental Data
  • Heat Transfer
  • Heat Transfer Coefficients
  • Heat Transmission
  • Mechanical Engineering
  • Prandtl Number
  • Schools
  • Steady State
  • Temperature Gradients
  • Test And Evaluation
  • Thermal Conductivity
  • United States

Readers

  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.
  • Phased Array Antenna Design.

Technology Areas

  • Microelectronics