Turbulent diffusion of momentum and heat from a smooth, plane boundary with zero pressure gradient: final report, part I

Abstract

The experimental equipment used in an investigation of turbulent diffusion of momentum and heat from a smooth, plane boundary with zero pressure gradient is described in Part I of this Final Report. A 10 ft long, 6 ft wide heated boundary, maintained at uniform temperature, formed part of the floor of the 6-ft square test section of a recirculating, low-velocity wind tunnel. Hot-wire anemometers were used for the measurement of mean velocities, intensities of turbulence, and turbulent shearing stress distributions in the momentum and the thermal boundary layers. Mean temperatures were measured with copper-constantan thermocouples. For the measurement of temperature fluctuations, a constant-temperature resistance thermometer was developed and used. The heat transferred from the boundary was determined from the electrical power input to the heater strips.