WHEN pulsations are imposed on a flowing fluid, it may normally be expected that heat transfer to or from it would be changed because the pulsations would alter the thickness of the boundary layer and hence the thermal resistance. In the laminar region, this view is also supported by the fact shown by Richardson1 that the velocity profile for pulsating flow is steeper near the wall than for smooth flow. It follows from a consideration of the Reynolds analogy that the heat transfer should increase under such conditions. A similar process might occur for turbulent flow also, but the equations are too cumbersome for analytical solution.