Abstract
An experimental investigation has been carried out to study the thermohydraulic performance of air in transitional flow regime in a circular uniformly heated channel fitted with flap obstruction at the inlet. The Reynolds number (Re) varied from 500 to 7,037. The channel is uniformly heated using heat fluxes of 0.5 and 1 kW/m2. Three height and width ratios were used as variable parameters. Correlations for predicting the Nusselt number and friction factor were developed. It was found that for a uniformly heated (1 kW/m2) plain channel, the critical Re for the start of transition is 2,752, and the critical Re for transition termination is 3,667. It was also found that placing the flap obstruction at the inlet of the test section results in early start and end of the laminar-turbulent transition. At heat flux of 0.5 kW/m2, the transition begins as early as Re = 1,840 and ends at Re = 3,588, and similarly, for a heat flux of 1 kW/m2, the transition begins at Re = 1,859 and ends at Re = 3,604. The highest Nusselt number enhancement was reported for hight ratio of 0.75 and width ratio of 0.25 and for a heat flux of 1 kW/m2.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.