Transient hydraulics and heat transfer in turbulent flow
Abstract
In a reactor transient analysis, the friction factor and the heat transfer coefficient are assumed equal to the steadystate values, even in a transient state. The transient turbulent flow in a circular tube subjected to a step change of presure gradient is calculated numerically. Transient variations of the friction factor and the heat transfer coefficient are obtained. Effects of the Reynolds number and a wall heat capacity are also examined. The quasistatic momentum equation is found to be approximately valid for both accelerated and decelerated turbulent flows. The quasistatic energy equation is valid for flow transients of gascooled reactors.
 Publication:

Nuclear Technology
 Pub Date:
 September 1976
 Bibcode:
 1976NucTe..30..246K
 Keywords:

 Friction Factor;
 Gas Cooled Reactors;
 Heat Transfer Coefficients;
 Hydraulics;
 Reactor Technology;
 Transient Response;
 Turbulent Flow;
 Nuclear Reactors;
 Numerical Analysis;
 Pressure Gradients;
 Steady State;
 Transient Heating;
 Wall Temperature;
 Fluid Mechanics and Heat Transfer