Kahveci K.Ece M.C.2024-06-122024-06-1219970272-5673https://hdl.handle.net/20.500.14551/17049The initial laminar thermal boundary-layer flow past an impulsively started translating and spinning rotational symmetric, permeable isothermal body is investigated. Velocity components and temperature are expanded in series in powers of time. Leading, first and second order functions are obtained analytically and the third, forth and fifth order functions are determined numerically. Application of the general results to a sphere shows that the unsteady flow field displays complex patterns. Surface blowing is observed to aid body spin in facilitating flow separation. Surface heat flux is enhanced near the front stagnation point and in the reversed flow region and reduced around the point of separation. Surface suction is found to increase the heat transfer while surface blowing decreases it.eninfo:eu-repo/semantics/closedAccessBoundary Layers; Flow Patterns; Functions; Heat Flux; Laminar Flow; Spheres; Unsteady Flow; Spinning Permeable Isothermal Body; Surface Blowing; Surface Suction; Heat TransferArticle3532932962-s2.0-0031356918N/A