Influence of Inlet Turbulence Intensity on Transport Phenomenon of Modified Diamond Cylinder: A Numerical Study
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Flows around bluff cylinder have received the attention of many researchers over the years. Therefore, the purpose of this paper was to study the effect of turbulence intensity on the transport phenomena over modified diamond cylinders which is investigated in this work. The bluff cylinders considered are of diamond shape and extruded diamond shape. The hydraulic diameter of bluff bodies is taken as the non-dimensional length scale. The simulation is done to cover cross-flow covering the laminar and turbulent regime with the Reynolds number reaching up to 10,000, while the inlet turbulent intensity is varied between 5 and 20%. The influence of turbulent intensity on enhancing heat transfer from the body has been emphasized in this work. The transition SST models along with governing equations (continuity, momentum, and energy equations) are solved numerically with ANSYS Fluent 19.2. The simulation results are validated with established correlations, and excellent agreement is found. This work demonstrates that the transition SST model can effortlessly bridge all flow regimes for predicting the heat transfer. The study computes the influence of inlet turbulence intensity on augmenting heat transfer from the bluff cylinders. The pressure and drag coefficients are found to be unaffected by the inlet turbulent intensity.
KeywordsTurbulent flow Heat transfer Diamond cylinder Forced convection Bluff body Swirl flow
The authors would like to gratefully acknowledge Mr. Arnab Banerjee, undergraduate mechanical engineering student of MCKV Institute of Engineering, and Mr. Sudhir Murmu, Research Scholar of Jadavpur University, for their support in this research. The authors gratefully acknowledges University of Pretoria for computational support.
- 4.Bearman, P.W.; Obasaju, E.D.: An experimental study of pressure fluctuations on fixed and oscillating square-section cylinders. J. Fluid Mech. 34, 625–639 (1982)Google Scholar
- 24.Zukauskas, A.: Heat transfer from tubes in cross flow. In: Harnett, J.P., Irvine Jr., T.F. (eds.) Advances in Heat Transfer, p. 8. Academic Press, New York (1978)Google Scholar
- 26.Murmu S.C.; Biswas, C.; Chattopadhyay, H.; Sarkar, A.: Numerical simulation of flow and heat transfer around circular cylinder. In: Proceedings of the 23rd National Heat and Mass Transfer Conference and 1st International ISHMT-ASTFE Heat and Mass Transfer Conference IHMTC 2015, 17–20 December, Thiruvananthapuram, India (2015)Google Scholar