Steady state convection heat transfer from a rotating cylinder to its
surrounding enclosure is a subject of practical importance. This type
of thermally driven flow is encountered in numerous applications
especially in some building service situations, when a pipe carrying a
hot water passes through an enclosure formed by structural
components of the building, rotating-tube heat exchangers, and the
drilling of oil wells. The function of the outer surface of the enclosure
is to reduce the heat transfer from the inner rotating hot cylinder or to
save the inner body in harsh outdoor environment. In recent years,
the flow around a rotating circular cylinder is considered a
fundamental fluid mechanics problem of great interest. It has
potential relevance to a huge number of practical applications such
as submarines, off shore structures, pipelines etc. Several numerical
and experimental methods have been developed to investigate
enclosures with and without rotating or stationary obstacle because
these geometries have great practical engineering applications. Chang
et al. [1] made a numerical analysis for natural convective heat
transfer in an irregular two-dimensional enclosure formed by an inner
square cylinder and an outer circular envelope.