Abstract
Numerical simulations were conducted to study the flow and heat transfer characteristics of the dimpled channel with a protrusion. The protrusion was located upstream of the dimple to enhance the flow mixing inside the dimpled channel. The height of the protrusion, h, and the diameter of the protrusion, d, are the variables considered in the present study. The ratio of the height to the diameter of the protrusion, h/d, was varied in the range of 0.2 to 0.4. A direct numerical simulation (DNS) was performed with a Reynolds number of 2800 and a Prandtl number of 0.71 on a total 10 geometries, including a general dimpled surface. Flow and thermal characteristics were analyzed by the time-averaged flow and thermal fields and the local Nusselt number distribution according to the configurations of the dimpled channel. The normalized Fanning friction factor, f/f0, Colburn j factor, j/j0, and volume goodness factor, Gv/Gv0, were calculated to evaluate the performances according to the configurations of the dimpled channel in terms of the pressure drop, heat transfer rate, and compactness of the heat exchanger. The volume goodness factor, Gv, was 27% larger in the case of h = 0.2 and d = 1.0 (h/d = 0.20) than that of a general dimpled surface.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
