Journal
APPLIED THERMAL ENGINEERING
Volume 225, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2023.120233
Keywords
Stirling cycle; Heat transfer; Intermittent motion; Oscillating flow; Sinusoidal motion
Ask authors/readers for more resources
In this study, the heat transfer and flow characteristics of intermittent oscillating flow in a tube were numerically investigated. The results showed that compared to sinusoidal oscillating flow, the total heat transfer coefficient was 14.6% lower and the pressure drop was 0.83% higher in intermittent oscillating flow. The pressure drop curves were similar in both flows, and the velocity distributions were also comparable.
Motions of piston and displacer in ideal Stirling cycle is non-sinusoidal and rise-dwell-fall-dwell. However, heat transfer and flow characteristics of present oscillating flow are based on sinusoidal motions. In this work, heat transfer and flow characteristics of intermittent oscillating flow with intermittent ratio = 1 in tube were numerically studied. The model was firstly validated based on literature's empirical equations for sinusoidal oscillating flow. Then, heat transfer and flow characteristics of intermittent and sinusoidal oscillating flows were simulated and compared. The simulation results showed that the total heat transfer coefficient and pressure drop in intermittent oscillating flow were 14.6% lower and 0.83% higher respectively compared to those in sinusoidal oscillating flow. The curves of pressure drop were nearly the same in sinusoidal and intermittent oscillating flows with removal of stagnation periods. Besides, velocity distributions in two oscillating flows were also investigated. The simulation results showed that the velocity loop in two oscillating flows occurred at the same time and the changing amplitudes of wall's velocity over central axis's velocity in velocity loop were nearly the same.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available