ANS:C - Reynolds

The jH factor for heat transfer typically depends on the Biot number. The Biot number (Bi) is a dimensionless number used in heat transfer calculations, particularly for problems involving heat conduction within a solid and convective heat transfer at the solid-fluid interface. It is defined as the ratio of the convective heat transfer resistance to the conductive heat transfer resistance within a solid body. Bi=Convective heat transfer resistanceConductive heat transfer resistanceBi=Conductive heat transfer resistanceConvective heat transfer resistance​ The jH factor is often used in conjunction with the Biot number to characterize heat transfer rates at the solid-fluid interface. It is defined as the product of the Nusselt number (Nu) and the Biot number (Bi). jH=Nu×Bi So, while the Nusselt number is a key parameter in convective heat transfer, the jH factor depends on both the Nusselt number and the Biot number. Therefore, the correct answer is: Biot.