Preliminary application of hot-film wall shear stress sensor under breaking waves

Hao Siyu; Xia Yunfeng; Xu Hua; Cai Zhewei

doi:10.11729/syltlx20170037

Volume 31 Issue 3

Turn off MathJax

Article Contents

Article Navigation > Journal of Experiments in Fluid Mechanics > 2017 > 31(3): 60-65

Hao Siyu, Xia Yunfeng, Xu Hua, et al. Preliminary application of hot-film wall shear stress sensor under breaking waves[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(3): 60-65. doi: 10.11729/syltlx20170037

Citation:

PDF( 649 KB)

Preliminary application of hot-film wall shear stress sensor under breaking waves

doi: 10.11729/syltlx20170037

Hao Siyu^{1, 2, 3, 4
,
,},
Xia Yunfeng^{1, 3, 4},
Xu Hua^{1, 3, 4},
Cai Zhewei^{1, 3, 4}

1.
Nanjing Hydraulic Research Institute, Nanjing 210029, China
2.
College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
3.
The State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Nanjing 210098, China
4.
Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport, Nanjing 210024, China

Received Date: 2017-03-06
Rev Recd Date: 2017-05-22
Publish Date: 2017-06-25

Abstract

Abstract

The knowledge of the bed shear stress under breaking waves is essential for understanding the sediment transport and beach morphology in the surf zone. The turbulence and vortexes generated by breaking waves have a significant effect on the bed shear stress. Application tests of the bed shear stress measurement under breaking waves by the MEMS flexible hot-film shear stress sensor are conducted in a wave flume. The experimental results show that the sensor can be applied to the measurement of the bed shear stress under breaking waves. Before the breaking point, the direction of the bed shear stress can be determined by the near-bed velocity. The change of the bed shear stress is gentle before wave breaking. The fluctuations and the peak value of the bed shear stress increase after wave breaking. The extreme value of the average maximum bed shear stress along the slope appears after the plunging point.
- breaking waves,
- wall shear stress sensor,
- bed shear stress,
- plunging breaker

FullText(HTML)

References(22)

References

[1]	邹志利.海岸动力学[M].第四版.北京:人民交通出版社, 2009. Zou Z L. Coastal hydrodynamics[M]. 4th ed. Bejing: China Communications Press, 2009.
[2]	Mirfenderesk H, Young I R. Direct measurements of the bottom friction factor beneath surface gravity waves[J]. Applied Ocean Research, 2003, 25(5): 269-287. doi: 10.1016/j.apor.2004.02.002
[3]	Huo G, Wang Y G, Yin B S, et al. A new measure for direct measurement of the bed shear stress of wave boundary layer in wave flume[J]. Journal of Hydrodynamics, Ser B, 2007, 19(4): 517-524. doi: 10.1016/S1001-6058(07)60148-6
[4]	Pujara N, Liu P L F. Direct measurements of local bed shear stress in the presence of pressure gradients[J]. Experiments in Fluids, 2014, 55(7): 1-13. doi: 10.1007/s00348-014-1767-8
[5]	Pujara N, Liu P L F, Yeh H. The swash of solitary waves on a plane beach: flow evolution, bed shear stress and run-up[J]. Journal of Fluid Mechanics, 2015, 779: 556-597. doi: 10.1017/jfm.2015.435
[6]	Arnskov M M, Fredsøe J, Sumer B M. Bed shear stress measurements over a smooth bed in three-dimensional wave-current motion[J]. Coastal Engineering, 1993, 20(3): 277-316. https://www.researchgate.net/profile/Tom_Baldock/publication/229027786_Direct_Bed_Shear_Stress_Measurements_in_Laboratory_Swash/links/00b7d518d634c47f8d000000.pdf
[7]	Sumer B M, Arnskov M M, Christiansen N, et al. Two-com-ponent hot-film probe for measurements of wall shear stress[J]. Experiments in Fluids, 1993, 15(6): 380-384. doi: 10.1007/BF00191776
[8]	Jensen B L, Sumer B M, Fredsøe J. Turbulent oscillatory boundary layers at high Reynolds numbers[J]. Journal of Fluid Mechanics, 1989, 206: 265-297. doi: 10.1017/S0022112089002302
[9]	Carstensen S, Sumer B M, Fredsøe J. Coherent structures in wave boundary layers. part 1. oscillatory motion[J]. Journal of Fluid Mechanics, 2010, 646: 169-206. doi: 10.1017/S0022112009992825
[10]	Musumeci R E, Marletta V, Andò B, et al. Measurement of wave near-bed velocity and bottom shear stress by ferrofluids[J]. IEEE Transactions on Instrumentation and Measurement, 2015, 64(5): 1224-1231. doi: 10.1109/TIM.2014.2359521
[11]	梁婷, 夏云峰, 徐华, 等.波浪作用下床面切应力测量初探[J].水道港口, 2010, 31(5): 425-428. http://www.cnki.com.cn/Article/CJFDTOTAL-SDGK201005036.htm Liang T, Xia Y F, Xu H, et al. Preliminary study of bed shear stress measurement under wave action[J]. Journal of Waterway and Harbor, 2010, 31(5):425-428. http://www.cnki.com.cn/Article/CJFDTOTAL-SDGK201005036.htm
[12]	Xu H, Xia Y F, Ma B H, et al. Research on measurement of bed shear stress under wave-current interaction[J]. China Ocean Engineering, 2015, 29(4): 589-598. doi: 10.1007/s13344-015-0041-z
[13]	Boers M. Surf zone turbulence[D]. Netherlands: Delft University of Technology, 2005.
[14]	Deigaard R, Fredsøe J, Mikkelsen M B.Measurements of the bed shear stress in a surf zone[R]. Progress Report 73, Lyngby: Institute of Hydrodynamics and Hydraulic Engineering, Technical University of Denmark, 1991: 21-30. http://www.academia.edu/10624279/Beach_Stratigraphy
[15]	Yüksel Y, Çevik E Ö, Kapdanşli S. Bed shear stress distribution over beach profiles[J]. Journal of Coastal Research, 1998, 14(3): 1044-1053.
[16]	Sumer B M, Sen M B, Karagali I, et al. Flow and sediment transport induced by a plunging solitary wave[J]. Journal of Geophysical Research: Oceans, 2011, 116(C1): C01008. http://orbit.dtu.dk/files/5597782/2010JC006435.pdf
[17]	Sumer B M, Guner H, Hansen N M, et al. Laboratory observations of flow and sediment transport induced by plunging regular waves[J]. Journal of Geophysical Research: Oceans, 2013, 118(11): 6161-6182. doi: 10.1002/2013JC009324
[18]	Schlichting H, Gersten K. Boundary-layer theory[M]. 9th ed. Berlin: Springer, 2016.
[19]	马炳和, 王毅, 姜澄宇, 等.柔性热膜剪应力传感器水下测量温度修正[J].实验流体力学, 2014, 28(2): 39-44. doi: 10.11729/syltlx20140006 Ma B H, Wang Y, Jiang C Y, et al. Temperature correction of flexible thermal shear stress sensor for underwater measurements[J]. Journal of Experiments in Fluid Mechanics, 2014, 28(2):39-44. doi: 10.11729/syltlx20140006
[20]	Knight D W, Patel H S. Boundary shear in smooth rectangular ducts[J]. Journal of Hydraulic Engineering, 1985, 111(1): 29-47. doi: 10.1061/(ASCE)0733-9429(1985)111:1(29)
[21]	Koca K, Noss C, Anlanger C, et al. Performance of the Vectrino Profiler at the sediment-water interface[J]. Journal of Hydraulic Research, 2017: 1-9. (in press, doi: 10.1080/00221686.2016.1275049.)
[22]	Murai Y. Frictional drag reduction by bubble injection[J]. Experiments in Fluids, 2014, 55(7): 1773. doi: 10.1007/s00348-014-1773-x