Abstract
Analysis is made for unsteady mixed convection induced by gravity around a sphere which is located in a vertical uniform stream and whose surface temperature is suddenly increased. Asymptotic solutions for small Reynolds number are obtained by using the method of matched asymptotic expansions. It is shown that the velocity is expressed in terms of four expansions reflecting the existence of four distinct regions in the (r, τ) plane, r and τ being a non-dimensional radial co-ordinate and the non-dimensional time respectively.
