Effect of Symmetric Bifurcation Angles on Fluid Flow through Tree Like Flow Network of Varying Scale
Term of Award
Summer 2017
Degree Name
Master of Science in Applied Engineering (M.S.A.E.)
Document Type and Release Option
Thesis (restricted to Georgia Southern)
Copyright Statement / License for Reuse
This work is licensed under a Creative Commons Attribution 4.0 License.
Department
Department of Mechanical Engineering
Committee Chair
David Calamas
Committee Member 1
Aniruddha Mitra
Committee Member 2
Mosfequr Rahman
Abstract
As the scale of electronic devices has continued to decrease and computing power has continued to increase there is a growing need for more efficient cooling techniques. The use of biologically-inspired designs have been shown to create more efficient, and more effective, cooling at a wide variety of scales. The effect of scaling on a microscale tree-like flow network was examined in this work for a variety of bifurcation angles. At microscale, these tree-like networks could be utilized in the thermal management of electronic devices. At larger scales, these networks could be employed in various forms of heat exchangers and solar flat plate collectors. A computational fluid dynamics model was created to investigate the impact of scale in tree-like flow networks of various bifurcation angles and subject to a range of inlet Reynolds numbers. The thermal and fluid performance of the tree-like flow networks was evaluated based on pressure drop and wall temperatures. Finally, in order to compare the performance of the tree-like networks across various scales, the results were non-dimensionalized in the form of the Reynolds, Euler, and Nusselt numbers.
Recommended Citation
[1] C. D. Murray, "The Physiological Principle of Minimum Work: I. The Vascular System and the Cost of Blood Volume," Proceedings of the National Academy of Sciences of the United States of America, vol. 12, no. 3, pp. 207-214, 1926. [2] D. V. Pence, "Improved Thermal Efficiency and Temperature Uniformity Using Fractal-Like Branching Channel Networks," in Heat Transfer & Transport Phenomena in Microscale, G. P. Celata, Ed., New York, Begell House, 2000, pp. 142-148. [3] D. V. Pence, "Reduced Pumping Power and Wall Temperature in Microchannel Heat Sinks with Fractal-Like Branching Channel Networks," Microscale Thermophysical Engineering, vol. 6, no. 4, pp. 319-330, 2003. [4] A. Y. Alharbi, D. V. Pence and R. N. Cullion, "Fluid Flow through Microscale Fractal-Like Branching Channel Networks," Journal of Fluids Engineering, vol. 125, no. 1, pp. 1051-1057, 2004. [5] A. Y. Alharbi, D. V. Pence and R. N. Cullion, "Thermla Characteristics of Microscale Fractal-Like Branching Channels," Journal of Heat Transfer, vol. 126, no. 5, pp. 744-752, 2004. [6] W. Wechsatol, S. Lorente and A. Bejan, "Tree-Shaped INsulated Designs for the Uniform Distribution of Hot Water Over an Area," International Journal of Heat and Mass Transfer, vol. 44, pp. 3111-3123, 2001. [7] W. Wechsatol, S. Lorente and A. Bejan, "Optimal Tree-Shaped Networks for Fluid Flow ina Disc-Shaped Body," International Journal of Heat and Mass Transfer, vol. 45, pp. 4911-4924, 2002. [8] W. Wechsatol, S. Lorente and A. Bejan, "Dentritic Heat Convection on a Disc," International Journal of Heat and Mass Transfer, vol. 46, pp. 4381-4391, 2003. [9] Y. Chen and P. Cheng, "Heat Transfer and Pressure Drop in Fractal Tree-Like Microchannel Nets," International Journal of Heat and Mass Transfer, vol. 45, pp. 2643-2648, 2002. [10] Y. Chen and P. Cheng, "An Experimental INvestigation on the Thermal Efficiency of Fractal Tree-Like Microchannel Nets," International Communications in Heat and Mass Transfer, vol. 32, no. 7, pp. 931-938, 2005. [11] X. Q. Wang, A. S. Mujumdar and C. Yap, "Thermal Characteristics of Tree-Shaped Microchannel Nets for Cooling of a Rectangular Heat Sink," International Journal of Thermal Sciences, vol. 45, no. 11, pp. 1103-1112, 2006. [12] X. Q. Wang, A. S. Mujumdar and C. Yap, "Effect of Bifurcation Angle in Tree-Shaped Microchannel Networks," Journal of Applied Physics, vol. 102, no. 7, 2007. [13] C. Zhang, Y. Lian, C. Hsu, J. Teng, S. Liu, Y. Chang and R. Greif, "Investigations of Thermal and FLow Behaviour of Bifurcations and Bends in Fractal_like Microchannel Networks: Secondary Flow and Recirculation Flow," International Journal of Heat and Mass Transfer, vol. 85, pp. 723-731, 2015. [14] C. Xia, J. Fu, J. Lai, X. Yao and Z. Chen, "COnjugate Heat Transfer in Fractal Tree-Like Channels Network Heat Sink for High-Speed Motorized Spindle Cooling," Applied Thermal Engineering, vol. 90, pp. 1032-1042, 20015. [15] L. Chen, H. Feng, Z. Xie and F. Sun, "Constructal Optimization for "Disc-Point" Heat Conduction at Micro and Nanoscales," International Journal of Heat and Mass Transfer, vol. 67, pp. 704-711, 2013. [16] H. Feng, L. Chen, Z. Xie and F. Sun, "Constructal Optimization of a Disc-Shaped Body with Cooling Channels for Specified Pumping," International Journal of Low Carbon Technologies, vol. 10, pp. 229-237, 2015. [17] R. A. Hart and A. K. da Silva, "Experimental Thermla-Hydraulic Evaluation of Constructal Microfluidic Structures Under Fully Constrained Conditions," International Journal of Heat and Mass Transfer, vol. 54, pp. 3661-3671, 2011. [18] M. R. Salimpour and A. Menbari, "Analytical Optimization of Constructal Channels Used for Cooling a Ring Shaped Body Based on Minimum Flow and Thermal Resistances," Energy, vol. 81, pp. 645-651, 2015. [19] G. Xie, F. Zhang, B. Sunden and W. Zhang, "Constructal Design and Thermal Analysis of Microchannel Heat Sinks with Multistage Bifurcations in Single-Phase Liquid Flow," Applied Thermal Engineering, vol. 62, no. 2, pp. 791-802, 2014. [20] Y. Li, F. Zhang, Sunden B and Xie G, "Laminar Thermal Performance of Microchannel Heat Sinks with Constructal Vertical Y-Shaped Bifurcation Plates," Applied Thermal Engineering, vol. 73, no. 1, pp. 185-195, 2014. [21] G. Xie, H. Shen and C. C. Wang, "Parametric Study on Thermal Performance of Microchannel Heat SInks with Internal Vertical Y-Shaped Bifurcations," Inernational Journal of Heat and Mass Tranfser, vol. 90, pp. 948-958, 2015.
Research Data and Supplementary Material
Yes
