Question

What heat-transfer mechanisms operate in the following phases of transfer? a. Heat transfer from the inside fluid to the tube wall b. Heat transfer through the tube wall c. Heat transfer from the tube wall to the outside fluid

Answer 1

a. Convection

Convective heat transfer is a mechanism of heat transfer occurring because of bulk motion (observable movement) of fluids.

b. Conduction

Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact

c. radiation

Thermal radiation is a direct result of the random movements of atoms and molecules in matter. Since these atoms and molecules are composed of charged particles (protons and electrons), their movement results in the emission of electromagnetic radiation, which carries energy away from the surface.