Accession Number:

ADA456032

Title:

Design of A Microgravity Spray Cooling Experiment

Descriptive Note:

Conference paper Postprint

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE

Report Date:

2006-07-01

Pagination or Media Count:

14.0

Abstract:

An analytical and experimental study was conducted for the application of spray cooling in a micro gravity and high-g environment. Experiments were carried out aboard the NASA KC-135 reduced gravity aircraft, which provided both the microgravity and high-g environments. In reduced gravity, surface tension flow was observed around the spray nozzle, due to unconstrained liquid in the test chamber and flow reversal at the heat source. A transient analytical model was developed to predict the temperature and the spray heat transfer coefficient within the heated region. Comparison of the experimental transient temperature variation with analytical results showed good agreement for low heat input values. The transient analysis also verified that thermal equilibrium within the heated region could be reached during the 20-25s reduced gravity portion of the flight profile.

Subject Categories:

  • Astrophysics
  • Physical Chemistry
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE