3-DIMENSIONAL THERMAL-CONVECTION CAUSED BY SPACECRAFT ROTATION IN A RECTANGULAR ENCLOSURE WITH RIGID WALLS

The influence of the spacecraft's rotation on the convection in a nonu niformly heated fluid under microgravity conditions has been studied. This influence is determined by action of the buoyancy force generated by the resultant microacceleration vector and the inertia force relat ed to variations in the angular rotational velocity of the spacecraft. It is shown that the solenoidal part of the resulting rotational forc e acting upon the nonuniformly heated fluid strongly depends on the an gle between the temperature gradient at some point in he fluid and the radius victor of this point relative to the spacecraft's centroid. To minimize the influence of the spacecraft's rotation, it is necessary to make this angle close to zero. The thermal convection which could h ave arisen in a rectangular box with rigid walls under rotation of the Space Shuttle orbiter has been simulated numerically. It is shown tha t the intensity of this kind of convection may be rather appreciable. (C) 1998 American Institute of Physics.