International Journal of Advances in Scientific Research and Engineering (ijasre) E-ISSN : 2454-8006 DOI: http://dx.doi.org/10.7324/ IJASRE.2017.32515 Vol.3 (9) Oct - 2017 www.ijasre.net Page 35 Experimental Investigation on the Influence of Density of Fluid On Efficiency of V- Notch M Sreenivasulu Reddy 1 and Dr.Y Ramalinga Reddy 2 1 Assistant Professor, 2 Dean and Director School of Civil Engineering, REVA University, Bangaluru ___________________________________________________________________________________________ ABSTRACT In open waterway flows, the data of the water discharge is a key parameter and a range of measurement technique was developed. Numerous procedures rely on some practical coefficients and there is a need to acquire new exact physical information to supplement the existing evidence. Stream measuring structures in waterworks, waterways and wastewater plants comprise basically of flumes and thin plate weirs .Thin-plate weirs empower a precise release estimation with straightforward instrument. These weirs ordinarily utilized as measuring gadgets in flumes and channels which empowers an exact release estimation with basic instruments. The calibration formulae of such gadgets depend upon some experimental coefficients and there is a need to acquire new exact physical information to adjust the current confirmation. In the present study, the discharge calibration of a large 90º V-notch with thin plate weir was used to find out the various coefficients with different density like clean water, mud water etc. The V-notch weir was initially closed by a fast-opening gate. The sudden opening induced an initial phase of the water motion dominated by the freefall motion of amount of liquefied in the locality of the weir, followed by a gradually-varied phase. The connection between water release and upstream water height was derived from the integral form of the continuity equation based upon high-frequency water elevation recordings. The outcomes yielded a dimensionless release coefficients Cd = 0.58 which is close to 90º V-notch weirs, as well as a string of unsteady orifice flow experiments. The results shows unsteady discharge calibration of the V-notch barrier yielded which enabling a relatively rapid calibration of the wall. Another advantage is the ability to test relatively large flow rates, when the water supply cannot sustain such large stable flow rates. Keywords: 90º V-notch weirs, water discharge, thin-plate weir. 1. INTRODUCTION The Thin-plate barrier is broadly used for measuring the flow of liquids in flumes and open channels. It is Simple in devise and easily made for available materials, it is expensive, convenient to use, and easy to maintain. In portable form it is frequently used to measure the flow of water in laboratories & small natural streams. When several forms of weirs or flumes are used. The triangular-notch barrier is often preferred because of its greater precision at low flows or its lesser sensitivity to approach-channel geometry and velocity distribution. In the range of conditions for which verification data are adequate, reasonable care in construction, installation. The thin-plate weir is a generally exact instrument. The triangular-score weir has been the subject of extensive exploratory research. In any case, the greater part of the lab examinations have been confined to a limited scope of scratch points and channel geometries. The 90°-indent weir has been most widely ascertained. Deficiencies in these formulas are concealed with numerous limits of applicability which greatly restrict their usefulness.