주기송풍온도변화법을 이용한 열전달계수와 유동방향 분산계수의 예측에 관한 연구

A periodic transient test techniqe based on the axial dispersion model is investigated for the simultaneous determination of both heat transfer coefficients and axial dispersion coeffieients in heat exchanger. It takes both axial dispersion in the fluid and axial heat conduction in the wall into account. The results of complex Fourier transform technique are compared with those of finite difference method. The predictions conducted on a flat plate array show that axial dispersion has a small effect on the temperature response at the heat exchanger outlet. It show that the finite difference method is better than the complex Fourier transform technique in view of time saving and accuracy.