Investigation of heat transfer characteristics for wavy-perforated plate-and-fin surface

A new wavy-perforated plate-and-fin surface is developed and tested by using the single blow technique. A one-dimensional transient heat conduction method is proposed to estimate the effect of non-uniform heat capacity distribution. The calculation shows that the effective mass of bars is very small. The experiments are then performed in the range of Re=350-4000 and the results are compared with those of wavy surface type 11.5-3/8 w in literature. It is found that the wavy-perforated heat transfer surface shows 20%-40% higher heat transfer coefficients in the whole test range. For Re<2000, the friction factors of the wavy-perforated surface are lower than or equal to those of the wavy surface in literature. But if Re>2000, a higher pressure drop is necessary for the test unit. So it is concluded that when Re is low, the wavy-perforated surface is a very good choice for compact heat exchangers.