Natural convection heat transfer at reduced pressures

ABSTRACT

This paper experimentally studies the natural convection heat transfer characteristics on horizontal and vertical plates at pressures lower than atmospheric value. Eight different pressures ranging from 10Pa to 101.325kPa, and three heating loads were used in the experiments. It is found that natural convection heat transfer characteristics at reduced pressures are independent of the plate arrangements and present different behaviors in two pressure ranges, 10Pa < p < 1000Pa and p > 1000Pa. The experimental heat transfer results are correlated into a non-dimensional equation to help the thermal design of stratosphere aircrafts and airborne equipment.

KEYWORDS:

• Natural convection
• reduced pressure
• plate
• stratosphere aircraft

Additional information

Funding

This work was supported by the National Key Technology R&D Program under grant number 2014BAK01B05, Defense Industrial Technology Development Program under grant number JCKY2016601B009, and National Natural Science Foundation of China under grant number 51175021 and 51506009.