HYBRID APPROACH FOR SOLVING UNSTEADY LAMINAR FORCED-CONVECTION INSIDEDUCTS WITH PERIODICALLY VARYING INLET TEMPERATURE

The transient forced convection in laminar flow inside a parallel plat e channel subjected to periodically varying inlet temperature is solve d by using a hybrid scheme that combines the generalized integral tran sform technique with a second-order accurate finite differences. Semi- analytical results are presented for the variations in the amplitude o f periodically varying fluid bulk temperature and wall heat flux along the channel length for different frequencies. An approximate formula for the decay of the peak bulk temperature amplitude is developed.