An investigation is being conducted at the KACA Lewis laboratory to obtain forced-convection heat-transfer and pressure-drop data for flow of air between electrically heated parallel flat plates stacked to form passages of short length-to-effective-diameter ratio. Two such stacks of plates were alined in series in the direction of air flow, with a l/4-inch spacing between plates in each stack. Data were obtained for three gap spacings between stacks of l/32, l/8, and l/4 inch, as well as for various degrees of plate misalinement between stacks, and also with the upstream stack removed from the tunnel. The primary purpose of the investigation is to determine the interference effects of the upstream stack of plates on the heat-transfer and friction character¬istics of the downstream stack.
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