Interaction between a hot flat plate and two counter-rotating side-by-side cylinders

摘要

In the present study, thermal-hydraulic characteristics of a hot flat plate located between two counter-rotating side-by-side cylinders are investigated numerically by means of the finite volume method. For cylinders, various non-dimensional vertical gap spaces (G/D) such as 0.3, 0.5, 1.0, and 2.0 and different rotating speeds (RS) between 0 and 4 are considered. Computations are carried out at several Reynolds numbers (Re) vary from 100 to 500 and the applied computer code is validated against the available data in the open literature. Several results in terms of time-averaged streamlines patterns, velocity and root mean square (RMS) velocity fields, and variations of skin friction factor and Nusselt number are presented and discussed in detail. It is found that, in Re = 100, locating cylinders with both zero and nonzero rotating speeds on sides of the plate has a negative effect from the heat transfer perspective in comparison to the conventional case. However, with the development of a considerable adverse pressure gradient on the plate at a higher Reynolds number such as Re = 500, counter-rotating side-by-side cylinders accelerate the heat exchange rate of the hot plate. The maximum heat transfer enhancement of the hot plate is reported as 112.4% for G/D = 0.5 under Re = 500 and RS = 4. It was hoped the obtained results arouse interest among the metallic sheet manufactures.