CFD Simulations of Fluid Flow Characteristics in Wavy Micro-Channels with Obstructions

Ashraf Balabel, Abdelfattah Mahrous


This work presents Computational Fluid Dynamics (CFD) simulations of laminar fluid flow characteristics through wavy micro-channels with obstructions. Two types of obstructions were computationally studied namely, cylindrically and spherically shaped obstructions. Based on the shape of obstacles, two micro-channels having the same hydraulic diameter were investigated: rectangular and cylindrical micro-channels. In addition, the position of obstructive elements next to either the crests or troughs of the wavy surface was computationally studied. The axial velocity and the corresponding pressure distributions in the transverse and longitudinal directions of flow were investigated near the regions of obstacles in order to predict the flow behavior. The computational results showed that the longitudinal and axial velocity profiles and the corresponding pressure distribution can predict the position of the obstacles through the flow stream. An important feature of the flow field can be observed in the case of spherical obstacles: the existences of negative velocity near the region of obstacles. This can be considered as a precursor of the flow separation. The region of expected flow separation would be increased by increasing the obstacle diameter as well as by increasing the flow Reynolds number. In general, the application of the present study is most appropriate to bioengineering as it resembles the study of blood flow and pressure in arteries and blood vessels where arteries are being changed in geometry and structure due to the existence of cholesterol cells.


Computational fluid dynamics; Laminar flow; Micro-channel; Obstacles; Wavy surfaces.

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V. Patel, J. T. Chon and J. Yoon, Turbulent flow in a channel with a wavy wall, Journal of Fluids Engineering, 113(4), 579-586, 1991.

M. Assato and M. J. De Lemos, Turbulent flow in wavy channels simulated with nonlinear models and a new implicit formulation, Numerical Heat Transfer, Part A: Applications, 56(4), 301-324, 2009.

E. M. Alawadhi and R. I. Bourisli, The role of periodic vortex shedding in heat transfer enhancement for transient pulsatile flow inside wavy channels, International Journal of Natural Sciences and Engineering, 1(2), 79-85, 2009.

F. V. Castellões, J. N. Quaresma and R. M. Cotta, Convective heat transfer enhancement in low Reynolds number flows with wavy walls, International Journal of Heat and Mass Transfer, 53(9), 2022-2034, 2010.

Y. Sui, C. J. Teo, P. S. Lee, Y. T. Chew, and C. Shy, Fluid flow and heat transfer in wavy microchannels, International Journal of Heat and Mass Transfer, 53(13-14), 2760-2772, 2010.

H. Shokouhmand and S. Bigham, Effects of entrance region transport processes on slip flow regime in a wavy wall microchannel with isothermally heated walls, Proceedings of the World Congress on Engineering, London, 2010, pp. 1-6.

L. J. Gong, K. Kota, W. Tao and Y. Joshi, Parametric numerical study of flow and heat transfer in microchannels with wavy walls, Journal of Heat Transfer, 133(5), 051702, 2011.

L. J. Gong, K. Kota, W. Tao and Y. Joshi, Thermal performance of microchannels with wavy walls for electronics cooling, IEEE Transactions on Components, Packaging and Manufacturing Technology, 1(7), 1029-1035, 2011.

Y. –S. Lin, C. –Y. Wu and Y. –C. Chu, Numerical study of fluid mixing in a grooved micro-channel with wavy sidewalls, International Journal of Mechanical and Mechatronics Engineering, 7(7), 1419-1423, 2013.

A. Balabel and A. Khadrawi, Numerical simulation of turbulent thermo-fluid dynamics in wavy microchannel, International Journal of Energy Science and Engineering, 1(3), 100-105, 2015.

J. Al-Muhammad, S. Tomas and F. Anselmet, Modeling a weak turbulent flow in a narrow and wavy channel: case of micro-irrigation, Irrigation science, 34(5), 361-377, 2016.

H. Wang, P. Iovenitti, E. Harvey and S. Masood, Optimizing layout of obstacles for enhanced mixing in microchannels, Smart Materials and Structures, 11(5), 662-667, 2002.

A. Waddell, J. Punch, J. Stafford and N. Jeffers, The hydrodynamic and heat transfer behavior downstream of a channel obstruction in the laminar flow regime, International Journal of Heat and Mass Transfer, 101, 1042-1052, 2016.

A. Sakanova, J. Zhao and K. –J. Tseng, Investigation on the influence of nanofluids in wavy microchannel heat sink, IEEE Transactions on Components, Packaging and Manufacturing Technology, 5(7), 956-970, 2015.

N. Tiwari and M. K. Moharana, Two-phase flow conjugate heat transfer in wavy microchannel, Proceedings of ASME 16th International Conference on Nanochannels, Microchannels, and Minichannels, Croatia, 2018, pp. 1-8.

L. Lin, J. Zhao, G. Lu, X. –D. Wang and W. –M. Yan, Heat transfer enhancement in microchannel heat sink by wavy channel with changing wavelength/amplitude, International Journal of Thermal Sciences, 118, 423-434, 2017.

Z. Parlak, Optimal design of wavy microchannel and comparison of heat transfer characteristics with zigzag and straight geometries, Heat and Mass Transfer, 54(11), 3317-3328, 2018.

P. K. Singh, D. S. Naruka and P. S. Lee, Numerical investigation of flow and heat transfer of nanofluids in a wavy microchannel, International Journal of Energy for a Clean Environment, 19(1), 19-35, 2018.

ANSYS Fluent, Fluent 15.0 User's Guide, Fluent Incorporated, Lebanon, NH, 2015.


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