Tiêu đề Mechanical Engg. Lab-1 (Thermal & Fluid) PCC-ME 206 UPDATED.pdf ✅

S.NO. NAME OF THE EXPERIMENT 1 Measurement of Coefficient of Discharge of given Venturi meter. 2 Measurement of Coefficient of Discharge of given Orifice meter 3 Determination of the performance characteristics of a centrifugal pump 4 Determination of the performance characteristics of Pelton Wheel 5 Determination of the thermal conductivity and specific heat of given objects 6 Determination of the p-V diagram and the performance of a 4-stroke diesel engine. 7 Determination of the performance characteristics of a vapour compression system
AIM:  To find the co-efficient of discharge.  To determine the pressure drop across the apparatus (optional)  To study the variation of co-efficient of discharge with Reynolds Number; Re (optional) INTRODUCTION: A Venturi Meter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. It consists of three parts: (i). A short conversing part (ii). Throat (iii). Diverging part A Venturi Meter apparatus is based on Principle of Bernoulli‟s equations. The principle of apparatus is that, by reducing the cross section area of flow passes, pressure difference is created and the measurement of pressure difference enables the determination of the discharge through the pipe. THEORY: A Venturi meter consists of an inlet section followed by a convergent cone, a cylindrical throat and a gradually divergent cone. By knowing the pressure difference across the inlet section and the throat, discharge can be calculated by the formula: Qa= Cd * Consider a venturimeter fitted in a horizontal pipe through which a fluid is flowing (say water), as shown: Let d1= diameter at inlet p1= pressure at inlet 2 2 2 1 1 2 a a a a 2gh  VENTURI METER APPARATUS EXPERIMENT 1
v1= velocity of fluid at inlet a1= area at inlet section= ∏*d1 2 /4 And d2, p2, v2, a2 are corresponding values at throat section (2). Applying Bernoulli‟s equation at both the inlet and throat section, and considering the pipe to be horizontal, The theoretical discharge Q is, Qt= 2 2 2 1 1 2 a a a a 2gh  Qact= Cd*Qt Where Cd = Co-efficient of venturimeter and its value is less than 1. The discharge co-efficient Cd accounts for viscous effects of the flow and depends upon the Reynolds number, Re (which is equal to Vd/ where, V=Q/a; and d is the diameter of the throat) and the ratio d/D as shown. Usually Cd varies between o.965 and 0.99 for the Reynolds number greater than 105 . MANOMETERS: Manometers are defined as devices used for measuring pressure at a point in a fluid by balancing the column of a fluid by the same or another column of the fluid. They are classified as: (a) Simple Manometers (b) Differential Manometers A Simple Manometer consists of a glass tube having one of its ends connected to a point where pressure is to be measured and other end remains open to the atmosphere. They are of three types: 1. Piezometer 2. U-tube Manometer 3. Single Column Manometer DESCRIPTION: The apparatus consists of a flow meter venturimeter made up of Clear Acrylic. The present experimental set-up for flow meter demonstration is a closed circuit apparatus consists of Venturimeter. A control valve is fitted at the discharge of the pipe line to vary the flow through the venturi meter. Pressure tappings are provided and connected to differential manometer to conduct the experiment.