http://repository.iitr.ac.in/handle/123456789/11633| Title: | Heat transfer and flow field features between surface mounted trapezoidal-ribs |
| Authors: | Ali M.S. Sharma N. Tariq, Andallib |
| Published in: | Journal of Mechanical Science and Technology |
| Abstract: | Present work is an experimental study of flow over array of trapezoidal-ribs transversely placed on the wider bottom surface of the rectangular passage. It is intended to study the profound impact of taper angle variation (0 to 20°) on the flow mechanism, and subsequently on heat transfer improvement. The local and augmentation heat transfer patterns have been investigated using liquid crystal thermography (LCT). Further, the aerodynamic characteristics, in a module between seventh and eight ribs, have been obtained using particle image velocimetry (PIV) for understanding the flow physics. Existence of large- and small-scale coherent structures within the detached shear layer zone have been confirmed and further explained by means of critical points. As compared to square rib, trapezoidal rib provides higher heat transfer rate just downstream of the rib, which is observed to be in line with the fluid flow results. © 2019, KSME & Springer. |
| Citation: | Journal of Mechanical Science and Technology (2019), 33(10): 5017-5023 |
| URI: | https://doi.org/10.1007/s12206-019-0940-7 http://repository.iitr.ac.in/handle/123456789/11633 |
| Issue Date: | 2019 |
| Publisher: | Korean Society of Mechanical Engineers |
| Keywords: | Flow modification Heat transfer enhancement Liquid crystal thermography Particle image velocimetry Thermohydraulic performance |
| ISSN: | 1738494X |
| Author Scopus IDs: | 55654866000 57194590686 57119258700 |
| Author Affiliations: | Ali, M.S., Department of Mechanical Engineering, Sreenidhi Institute of Science and Technology, Hyderabad, Telangana 501301, India, AVTAR Lab, Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India Sharma, N., AVTAR Lab, Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India, Department of Mechanical Engineering, DVR & Dr. HSMIC College of Technology, Kanchikacherla, A.P. 521180, India Tariq, A., AVTAR Lab, Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India |
| Funding Details: | This work is supported by the Ministry of Human Resource Development (MHRD), and Department of Science and Technology (DST), India. e Height of the rib, mm f Friction factor of the ribbed duct f o Friction factor of the smooth duct h Convective heat transfer coefficient, W/m 2 K k Thermal conductivity of the substrate, W/mK Nu Nusselt number of the ribbed surface Nu o Nusselt number of the smooth duct Re Reynolds number T a Ambient temperature, °C T i Initial wall temperature, °C T w Wall surface temperature, °C TI Turbulence intensity, m/s U r Average velocity at test section inlet, m/s u Stream-wise component of time-averaged velocity, m/s v Normal component of time-averaged velocity, m/s x’ Distance from downstream side of the rib, m α Taper angle, ° α s Thermal diffusivity of perspex, m 2 /s Ï a Air density, Kg/m 3 |
| Corresponding Author: | Sharma, N.; AVTAR Lab, Mechanical and Industrial Engineering Department, Indian Institute of Technology RoorkeeIndia; email: sharma.naveen28@yahoo.com |
| Appears in Collections: | Journal Publications [ME] |
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