Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 21, No. 3 (October 2008) 249-256   

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  TWIN PLATE WEIR: A FLOW MEASURING DEVICE (TECHNICAL NOTE)
 
 
A. Goel*

Department of Civil Engineering, National Institute of Technology
Deemed University, Kurukshetra-136119
Haryana, India
drarun_goel@yahoo.co.in
 

 *Corresponding Author

 
( Received: September 01, 2007 – Accepted in Revised Form: May 09, 2008 )
 
 

Abstract    For efficient use of water, accurate measurement of flow in (field/laboratory) channels is required for many water resource projects. The present work is aimed to study the flow characteristics of a twin plate weir (two sharp-crested plates are placed one behind the other at some distance) under free and submerged flow conditions. Experiments are performed with four spacing of the twin plate weir ranging from 10 cm to 40 cm under free and submerged flow conditions. It was observed that the coefficient of discharge (Cd) is a function of head over the crest (H1) and height of the plate of the weir (P) in free flow condition. The critical submergence (H2/H1) increases as the discharge increases, for a particular spacing of the twin plate weir (L). The critical submergence also increases with the increase in the spacing of the weir plates for any discharge. When some material fills the space between the two plates, the Cd increases as the percentage of filling increase. The device may prove quite useful when siltation occurs between the twin plate weirs. The device could be utilized in laboratory/industry channels for the discharge measurement.

 

Keywords    Channels, Coefficient of Discharge, Weirs, Discharge Measurement

 

References   

1. Lakshmana Rao, N. S., “Theory of Weirs”, Advances in Water Science, V T Chaw (ed), Academic Press, New York, U.S.A., Vol. 10, (1975), 309-406.

2. Bos, M. G., “Discharge Measurement Structures”, Int. Inst. for Land Reclamation and Improvement, Wegeningen, The Netherlands, No. 20, (1976), 17-65.

3. Ackers, P., “Weirs and Flumes for Flow Measurement”, John Wiley and Sons Ltd, Chichester, U.K., (1978).

4. Subramanya, K., “Flow in Open Channels”, TMH Pub Company, New Delhi, India, (1995).

5. Wu, S. and Rajaratnam, N., “Submerged flow Regimes of Rectangular Sharp Crested Weirs”, J. of Hydraulic Div ASCE, Vol. 122, No. 7, (1996), 412-414.

6. Johnson, M. C., “Discharge Coefficient Analysis for Flat Topped and Sharp Crested Weir”, Journal of Irrigation Science, Vol. 19, (2000), 133-137.

7. Baylar, A. and Emin Emiroglu, M., “The Effect of Sharp-Crested Weir Shape on Air Entrainment”, Can.Journal of Civil Engineering, Vol. 29, No. 3, (2002), 375-383.

8. Ismail, A., Metin Ger, A. and Hincal, O., “Measurement of Small Discharges in Open Channels by Slit Weir”, Journal of Hydraulic Engineering, ASCE, Vol. 128, No. 2, (February 2002).

9. Ismail, A., Altan-Sakarya, A. B. and Metin Ger, A., “Performance of Slit Weir”, Journal of Hydraulic Engineering, Vol. 132, No. 9, (September 2006), 987-989.

10. Ranga Raju, K. G., “Flow Through Open Channels”, TMH Pub. Company, New Delhi, India, (1993).

11. Dilip, K., “Flow Over Tandom Sharp Crested Weir”, M. Tech. Thesis, Kurukshetra University, Kurukshetra, India, (1993).

12. Borghei, S. M., Vatannia, Z., Ghodsian, M. and Jalili, M. R., “Oblique Rectangular Sharp-Crested Weir”, J. of Water Management, Vol. 1





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