Aerodynamic resistance of perforated plates in natural convection

This paper describes some experimental results about aerodynamic resistance of perforated plates in natural convection, which are useful for designing casings of electronic equipment. Since velocity through a perforated plate and pressure loss are very small in the case of natural convection, the conventional method can not be used to measure the resistance of the plate with reasonable accuracy. Therefore, a new method was developed to obtain resistance coefficients of plates by temperature measurement, since differential temperature between the upstream flow of a perforated plate and the downstream one is related to its aerodynamic resistance. Using the proposed method, further experiments were performed to study the influence of various parameters, such as Reynolds number, porosity coefficient, and plate thickness/hole diameter on resistance coefficients of perforated plates.