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This work aims to study the behaviour of the fluid inside a square chamber that has two openings at the top of vertical walls for the entry and exit of the fluid. Also, the chamber is arranged around two hot cylinders located vertically. The fact that the fluid is cold and the walls of the cylinders are hot, a vertical transfer of the fluid is shown due to thermal buoyancy force. The study was accomplished numerically. The pertinent parameters examined are as follows: the number of Reynolds (= 1-40) and the number of Richardson (= 0-1). The value of Prandtl number of the working fluid is ( Pr  = 1). The values of  Nu  number for the two cylinders are calculated and expressed in terms of the values of  Re  and  Ri . The results showed that the effect of the fluid on the cylinders differs from the lower cylinder to the upper cylinder. Also, the presence of counter-flows in some cases creates hydrodynamic force in the opposite direction. For example, for  Re  = 40 increasing the  Ri  value from 0 to 1 increases  Nu  by an average of 3.84% for the upper obstacle and 81% for the lower one.

Study on the effect of flow velocity and thermal buoyancy on the dynamic behaviour of flow inside a two-hole chamber