Pressure Drop and Heat Transfer in Crushed Limestone
ABSTRACT PRESSURE drop due to air flow through crushed limestone, which has been screened to a rather uniform size and compacted into a container, has been correlated with data available in the literature. However, the pressure drop for uncompacted samples and for varied sizes of stone within the same sample, could not be predicted using any of the available data in the literature. Analytical and experimental studies of heat transfer between the flowing air and crushed limestone show that for reverse flow discharge the quantity of heat which can be recovered from a rock bed decreases as rock size increases. The suggested design procesure for rock bed heat storages utilizing reverse flow discharge is to select the smallest size stone which is consistent with the maximum allowable pressure drop through the bed.