Mechanism of Effect of Aspect Ratios on Single-Phase Water Flow Behaviors in Narrow Rectangular Ducts

XING Dian-chuan; YAN Chang-qi; CAO Xia-xin; LIU Chuan-cheng; SUN Bo

doi:10.7538/yzk.2013.47.01.0043

Atomic Energy Science and Technology > 2013 > 47(1): 43-47. > DOI: 10.7538/yzk.2013.47.01.0043

XING Dian-chuan, YAN Chang-qi, CAO Xia-xin, LIU Chuan-cheng, SUN Bo. Mechanism of Effect of Aspect Ratios on Single-Phase Water Flow Behaviors in Narrow Rectangular Ducts[J]. Atomic Energy Science and Technology, 2013, 47(1): 43-47. DOI: 10.7538/yzk.2013.47.01.0043

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Mechanism of Effect of Aspect Ratios on Single-Phase Water Flow Behaviors in Narrow Rectangular Ducts

College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China

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Single-phase water flow behaviors in narrow rectangular ducts were studied theoretically and experimentally. The results show that aspect ratios have significant influence on flow resistance. The frictional resistance in rectangular duct increases as the aspect ratio decreases both in laminar flow region and the smooth region of turbulent flow. The visual observation shows that critical Reynolds number for narrow rectangular ducts ranges from 2 500 to 2 600, and the aspect ratio nearly has insignificant influence on flow regime transition. The single-phase flow resistance is influenced significantly by wetting perimeter and velocity distribution, which vary with the aspect ratio in laminar flow. For turbulent flow, the turbulent mean velocity in viscous sub-layer and wetting parameter become important parameters affecting the flow resistance.
- narrow rectangular duct,
- aspect ratio,
- frictional resistance,
- wetting perimeter,
- velocity distribution

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[1]	徐建军，陈炳德，王小军. 窄缝流道内的流动与换热机理及关键问题[J]. 核动力工程，2008,29（3）:9-14.XU Jianjun, CHEN Bingde, WANG Xiaojun. Flow and heat transfer mechanism and key issues in a narrow channel[J]. Nuclear Power Engineering, 2008, 29(3): 9-14(in Chinese).
[2]	STEINKE M E, KANDLIKAR S G. Single-phase liquid friction factors in microchannels[J]. International Journal of Thermal Sciences, 2006, 45(11): 1073-1083.
[3]	HRNJAK P, TU X. Single phase pressure drop in microchannels[J]. International Journal of Heat and Fluid Flow, 2007, 28(1): 2-14.
[4]	徐建军，陈炳德，王小军，等. 矩形窄缝流道内窄边附近流场的实验研究和数值模拟[J]. 水动力学研究与进展，2006，21（6）：770-775.XU Jianjun, CHEN Bingde, WANG Xiaojun, et al. Experimental research and numerical simulation of flow field near the narrow side in a rectangular narrow channel[J]. Chinese Journal of Hydrodynamics, 2006， 21（6）: 770-775（in Chinese）.
[5]	徐建军，陈炳德，王小军. 矩形窄缝通道内湍流充分发展区流动边界层探析[J]. 核动力工程， 2011,32(1):95-99.XU Jianjun, CHEN Bingde, WANG Xiaojun. Analysis and discussion of flow boundary layer in fully turbulent of narrow rectangular channel[J]. Nucl Power Eng, 2011, 32(1): 95-99(in Chinese).
[6]	PAPAUTSKY I, GALE B K, MOHANTY S, et al. Effects of rectangular microchannel aspect ratio on laminar friction constant[C]∥Proceedings of SPIE Symposium on Micromachining and Microfabrication: Microfluidic Devices and Systems. Santa Clara, CA: [s.n.], 1999: 20-21, 147-158.
[7]	MO H L. Characteristics of friction factor of gas flowing through small rectangular ducts[J]. Cryogenics, 1998, 38(9): 869-873.
[8]	SHAH R K, LONDON A L. Laminar flow forced convection in ducts: A source book for compact heat exchanger analytical data[M]. New York: Academic Press, 1978.
[9]	SADATOMI M, SATO Y, SARUWATARI S. Two-phase flow in vertical noncircular channels[J]. International Journal of Multiphase Flow, 1982, 8(6): 641-655.
[10]	幸奠川，阎昌琪，曹夏昕，等. 矩形窄缝通道内单相水流动特性研究[J]. 原子能科学技术，2011,45（11）：1312-1316.XING Dianchuan, YAN Changqi, CAO Xiaxin, et al. Research on characteristics of single-phase water flow in narrow rectangular channel[J]. Atomic Energy Science and Technology, 2011, 45(11): 1312-1316(in Chinese).
[11]	KAYS W M, CRAWFORD M E, WEIGAND B．Convective heat and mass transfer[M]. 4th ed. USA: McGraw-Hill, 2005.

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