Effects of centrifugal buoyancy on developing convective laminar flow in a square channel occupied with a high porosity fibrous medium

High-Porosity Metal Foams: Potentials, Applications, and Formulations

“…Similarly, they have been proposed as an effective way to enhance the heat dissipated from heavy-duty electrical generators through filling their rotating cooling passages either fully or partially with open-cell metal foams [23][24][25]. The value of the this proposal was inspected by introducing an enhancement factor as the ratio of heat transported to the pumping power required, that is, Nu Re p in Àp e ðÞ =ρu 2 in , and comparing it with the corresponding values from a previous work regarding turbulent flow in a rotating clear channel [26], as shown in Figure 4 [25], where it was confirmed that the proposed enhancement is practically justified and efficient.…”

Developing convective flow in a square channel partially filled with a high porosity metal foam and rotating in a parallel-mode

“…Therefore, it needs to be known whether it is worth using metal foams in the current problem or not. To do so, the overall enhancement factor used earlier by the authors Alhusseny and Turan [30] is re-employed in the current analysis, which is defined as the ratio of heat transported to the pumping power Nu/(ReΔP) (or the ratio of gain to the cost). So, as long as this factor is higher, the overall efficiency is better.…”

“…It was found that this proposal enhances the amount of heat transported between the solid and fluid phases, and hence, improves the overall efficiency of cooling process. More recently, Alhusseny and Turan [30] and Alhusseny et al [31] studied numerically the thermally and hydrodynamically developing flow through a channel rotating in a parallel-mode and fully filled with high porosity metal foam, where effects of rotation, geometrical and thermal characteristics of the fiber, channel aspect ratio, and thermal dispersion on heat transfer performance were investigated.…”

Rotating metal foam structures for performance enhancement of double-pipe heat exchangers

“…Also, their open-cell structure makes them less resistant to the fluids flowing through them, and hence, pressure drop across them is much less than it in the case of flow via packed beds or granular porous media. Therefore and due to their ability to meet the highly thermal demands with no excessive loss in pressure, open-cell metal foams have been utilised in heat exchangers [14], [15] besides internal cooling of both turbine blades [16] and the rotor windings of high-capacity electrical generators [17], [18], and [19]. Thus, it is not surprising to use them recently in double-pipe heat exchangers [20] and [21], where a substantial enhancement in the heat transfer performance has been acquired.…”

“…It was found that this proposal enhances the amount of heat transported between the solid and fluid phases, and hence, improves the overall efficiency of cooling process. More recently, Alhusseny and Turan [17] and Alhusseny et al [18] studied numerically the developing flow through a channel rotating in a parallel-mode and fully filled with high porosity metal foam, where effects of rotation, geometrical and thermal characteristics of the fiber used, channel aspect ratio, and thermal dispersion on heat transfer performance were investigated.…”