Accession Number:

ADA158757

Title:

Spacecraft, Straight-Tube Evaporator Design

Descriptive Note:

Final rept. 1 Jul 1983-31 Mar 1985

Corporate Author:

AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1985-05-01

Pagination or Media Count:

83.0

Abstract:

Two-Phase liquid-vapor heat transfer systems are being considered for use on future spacecraft cooling systems operating at high energy levels. The design of straight-tube evaporators was studied for this application. The forced convective boiling phenomenon was examined to determine the characteristics of boiling flow and possible effects of gravitational acceleration. Experiments with straight-tube evaporators indicated that pressure fluctuations caused by slug flow may hamper efforts to build two-phase cooling systems. Upstream orifices and twisted tape inserts were investigated to overcome this problem. A method was also developed to size an evaporator based on the best available correlation equations. Some errors were corrected for flow-boiling heat transfer equations found in the literature.

Subject Categories:

  • Air Conditioning, Heating, Lighting and Ventilating
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE