Heat transfer and velocity fluctuations in a staggered tube array

摘要

This paper describes an experimental investigation of unsteady heat transfer and velocity in a staggered tube array. The velocity measurements were obtained with a laser Doppler anemometer and a surface mounted hot film sensor was used to make the heat flux measurements. Data are presented in the form of time-averaged Nusselt numbers and fluctuating heat transfer rates, along with velocity and heat flux autospectra. The coherence and phase difference between the velocity and heat flux signals is included also. For the front of a cylinder in the first row, the results obtained indicate that the fluctuations in surface heat flux originate in whole field velocity pulsation resulting from vortex shedding. For the remainder of the array, the results indicate that the heat flux variation is governed by turbulent eddy transport originating in the breakdown of shed vortices as the flow progresses through the array. (C) 1998 Elsevier Science Inc. All rights reserved. References: 23