Response of parallelflow and counterflow heat exchangers to sinusoidal flow rate changes of large amplitude
Abstract
A computational procedure for obtaining both the steadystate responses and the describing functions of parallel flow and counterflow heat exchangers subject to sinusoidal flow rate changes of large amplitude is presented. The describing functions are defined in terms of both amplitude and circular frequency and represent the relationship between input and output fundamental components. The describing functions are depicted in a complex plane in terms of both amplitude and circular frequency, and the effects of the amplitude on the inputoutput relationship of fundamental components are shown. The computed steadystate periodic responses are in good agreement with the digital simulation results obtained with the RungeKuttaGill method. The method discussed allows the inputoutput relationships of fundamental components to be obtained and the nonlinear behavior of the steadystate periodic responses to be computed without experiments.
 Publication:

JSME International Journal Series B
 Pub Date:
 December 1982
 Bibcode:
 1982JSMEB..25.1994T
 Keywords:

 Computational Fluid Dynamics;
 Counterflow;
 Flow Velocity;
 Frequency Response;
 Heat Exchangers;
 Parallel Flow;
 Functions (Mathematics);
 Pulse Amplitude;
 Sine Waves;
 Steady State;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer