Venturimetre Deneyinde Gerçek ve Teorik Debi İlişkisi İçin Debi Düzeltme Katsayısının Belirlenmesi

Abstract

It is not always practical to calculate the discharge through the pressure pipes in fluid mechanics. Therefore, empirical equations obtained by experimental methods are widely used. Real discharge measured in the venturimeter experiment is compared with theoretical discharge calculated using the continuity and Bernoulli equations in this study. Discharge coefficient (Cd) is used in order to use theoretical discharge as real discharge in the literature. The reason for this is that the major and minor head losses are not taken into account in theoretical discharge calculation. Discharge coefficient is recommended in the range of 0.8-1.0. Cd coefficient is obtained by dividing the real discharge by theoretical discharge. In other words, real discharge of the fluid is found by adding Cd coefficient to the formula of theoretical discharge. Major and minor head losses in flow occurring in the pipe are calculated empirically. Darcy-Weisbach equation is used for major head losses and loss coefficients are used for minor head losses. It is not always practical to calculate head losses of flow in the pipe. Consequently, discharge coefficient is preferred in cases where discharge calculation is practically not required. Six different observations are made for real discharge in venturimeter experiment in this study. Firstly, maximum discharges are given to the experiment set and then discharge is reduced with the help of the valve. Water is selected as the fluid in the pipe. The volume of water accumulated per unit time is calculated by filling the reservoir with water for dischage measurement. According to the findings, the discharge coefficient is obtained as a narrower range 0.939-0.975. In addition, a strong relationship between the discharge coefficient and theoretical discharge is observed. For this purpose, the determination coefficient (R2 ) is calculated. Thus, fluid water is selected for the flow in the pipe and the discharge coefficient is revised for this type of work. Discharge coefficients can be examined by using higher viscosity fluids such as milk and oil for future studies.