Extension of RC Circuit Analogy for Natural Convection

Present study investigated the analogy further by redrawing the equivalent circuit as shown in the Fig.1 . The corresponding resistance is drawn as a combination of two parallel resistances. The fixed resistance (R) is due to the conduction, while the variable resistance (R,h)is due to convection and depends on state of flow. Likewise, the capacitor of the equivalent circuit is also drawn as two parallel capacitors. Cth represents the thermal capacitance of the system, constant and depends on the fluid properties only. CK E is the Kinetic Energy Capacitance of the system which for a given geometry depends on the fluid properties as well as the flow characteristics.