Overall scale-model simulation of mixed-convection flow

Mixed convection is often a major source of difficulty for industrial projects. Where three-dimensionality or non-stationary conditions rule out the use of a mathematical model, overall scale-model simulation provides an ideal means of investigation, but only if dimensions, and therefore Reynolds number, can be reduced. This type of simulation requires considerable caution, however, especially where heat or material transfers causing density differences affect the fluid through the walls. Various choice-determining factors are discussed, especially as regards their effect on the choice of a model fluid. The effect of given Peclet number distortions is investigated against the general background of Froude similarity. Diagrams applicable to various industrial conditions illustrate the high-variable nature of simulation procedure. This can be reduced quite appreciably by artificial wall-roughening