Chapter 8, Problem 8.92P

A printed circuit board (PCB) is cooled by laminar. fully developed airflow in adjoining, parallel-plate channels of length L and separation distance a The channels may be assumed to be of infinite extent in the transverse direction, and the upper and lower surfaces we insulated. The temperature $T_s$ of the PCB board is uniform, ¡md airflow with an inlet temperature of $T_{m,i}$ , is driven by a pressure difference $\Delta p$ . Calculate the average heat removal rate per unit area $\left({\text{W/m}}^2\right)$ from the PCB.