Similarity between velocity and temperature fields in a turbulent plane jet

The similarity between velocity and temperature fields in the self-preserving region of a plane jet is examined by considering spatial contours of ensemble averages of quantities formed using velocity u and v and temperature theta fluctuations. These averages were conditioned on the occurrence of temperature fronts observed with the use of a spanwise rake of temperature sensors. Reasonable similarity exists between overall correlation coefficients for u and v and for v and theta. There is also similarity between contributions from the random motion to these coefficients but, in this case, the spatial distribution is quite different than when the coherent contribution is included. Contributions to the Reynolds shear stress, temperature variance, and lateral heat flux from coherent and random motions are roughly equal. The random motion makes a significantly larger contribution to the Reynolds normal stresses than does the random motion.