TURBULENT DIFFUSION OF MOMENTUM AND HEAT FROM A SMOOTH, PLANE SOUNDARY WITH ZERO PRESSURE GRADIENT

摘要

The experimental equipment used in an investigation of tur¬bulent diffusion of momentum and heat from a smooth, plane boundary with zero pressure gradient is described in fart I of this Final Report.nA 10 ft long, 6 ft wide heated boundary, maintained at uni¬form temperature, formed part of the floor of the 6-ft square test sec¬tion of a recirculating, low-velocity wind tunnel. Hot-wire anemom¬eters 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 devel¬oped and used. The heat transferred from the boundary was determined from the electrical power input to the heater strips.