Convective-radiative heat exchange in a cube with a flat heated element under the rotation effect around coordinate axis

The production of a various engineering systems is accompanied by studies of liquid flow structures and thermal energy patterns. Many engineering systems in electronics and energy are affected by rotation and an important task becomes the description of physical phenomena under rotational effects. This investigation is dedicated to convective-radiative thermal and mass transport inside a rotating cube having a flat heated element placed on the bottom surface. The rotation of the cube around each of the axes of Cartesian coordinates has been considered. Governing equations based on mass, momentum and energy conservation laws are written employing the non-primitive variables. The set of control equations is resolved by the finite difference schemes. The influences of angular velocity, rotation axis orientation, and emissivity of surfaces on the intensity of heat transfer have been shown. Temperature patterns for various rotation angles are presented and described in detail. The results demonstrate that rotation around the vertical axis shows a steady-state of the Nusselt numbers, while rotation around the horizontal axis shows the periodic changes. It is interesting that similar heat exchange modes are formed during rotation around horizontal axes. More intensive convective and radiative heat exchange is observed in the case of rotation around an axis at which the cooling walls change their position. • Angular velocity, rotation angle, and emissivity effect on heat transfer is shown. • The rotation around vertical axis significantly reduces the average Nusselt number. • A rise in rotation rate leads to a suppression of convective heat transfer. • A rise in rotation rate leads to an increase in thermal radiation. • Rotation around horizontal axis has higher heat transfer than one around vertical axis.