Transport of Heat Across a Plane Turbulent Mixing Layer

Publisher Summary A well-known characteristic of turbulent shear flows is that the spread of scalar quantities—that is, heat or matter, is faster than the spread of momentum. This chapter describes a model for the transport mechanism of a scalar quantity in typical turbulent shear flows. In the present state of the investigation, measurements of the temperature field alone have been obtained and the temperature field is mathematically represented by four equations; the equation of motion, the continuity equation for the mean velocities, the heat-transfer equation, and the equation of the balance of temperature fluctuations. The chapter provides some important observations, such as based on the shape of the temperature fluctuations as well as the mean quantity distributions it can be assumed that the transport mechanism is largely due to a large scale vortical motion, the mean temperature distribution in the turbulent domain is largely homogeneous, the temperature across a single vortex is linear in the mean, and the temperature fluctuation variance in the turbulent domain is approximately constant.