Question

Which of the following flow is best suited for space shuttle?

(a) continuum flow

(b) free molecular flow

(c) turbulent flow

(d) laminar flow

This question was addressed to me in an interview for internship.

This key question is from Finite Control Volume Approach in chapter Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Correct answer is (b) free molecular flow

For explanation: In free molecular flow, the gas molecules are spaced so far apart that collisions with the body surface occur only infrequently and the body surface can feel distinctly each molecular impact which reduces the vibration in the space vehicle.