Headloss Through a Valve
CEE 320 Fluid Mechanics Lab
Head Loss Through a Valve
April 24, 2012
Abstract
This experiment determined the relationship between the head loss through a gate valve and the degree of opening of that valve with varying flow rates. The objective of this experiment was to determine the valve loss coefficient, K, for a specific gate valve as a function of both the pipe Reynolds Number, and the degree of opening. The relationship between the Reynolds Number and the friction factor was constant. Regardless of what the Reynolds Number was, the friction factor remained the same. This means that the valve head loss coefficient, K, only depended on the degree of opening of the gate valve. As the valve is slowly turned closed, the Major Head Loss due to friction along the pipe, decreases, and the Minor Head Loss, due to the friction through the gate valve, increases. There is a positive linear relationship between the Reynolds Number and the head loss coefficient. The slope of this linear relationship showed that as the flow rate increases, the velocity increases which means the Reynolds Number gets bigger and the head loss coefficient increases. Therefore, the higher the flow and the smaller the degree of opening of the gate valve, the greater the head loss becomes through the gate valve.
Table of contents Abstract………………………………...……………………………………………………………...i 1 Introduction 1 1.1 Background 1 1.2 Theory 1 1.3 Objective 1 2 Apparatus and Supplies 1 3 Procedures 4 4 Equations 4 5 Experimental Results 5 6 Error Analysis 9 7 Conclusions 9 8 Recommendations for Further Studies 10 9 References 10 APPENDIX Table of Figures Figure 21: Pressure Differential Gauge Δp. 2 Figure 22: Weighing Tank with Dump Valve open. 3 Figure 23: Pressure Differential Gauge between Valve Set-up 3 Table 51: Constants and given values. 5 Table 52: Measured Data. 5 Table 53: Volumetric Flow, Velocity, Reynolds #, Head
Head Loss Through a Valve
April 24, 2012
Abstract
This experiment determined the relationship between the head loss through a gate valve and the degree of opening of that valve with varying flow rates. The objective of this experiment was to determine the valve loss coefficient, K, for a specific gate valve as a function of both the pipe Reynolds Number, and the degree of opening. The relationship between the Reynolds Number and the friction factor was constant. Regardless of what the Reynolds Number was, the friction factor remained the same. This means that the valve head loss coefficient, K, only depended on the degree of opening of the gate valve. As the valve is slowly turned closed, the Major Head Loss due to friction along the pipe, decreases, and the Minor Head Loss, due to the friction through the gate valve, increases. There is a positive linear relationship between the Reynolds Number and the head loss coefficient. The slope of this linear relationship showed that as the flow rate increases, the velocity increases which means the Reynolds Number gets bigger and the head loss coefficient increases. Therefore, the higher the flow and the smaller the degree of opening of the gate valve, the greater the head loss becomes through the gate valve.
Table of contents Abstract………………………………...……………………………………………………………...i 1 Introduction 1 1.1 Background 1 1.2 Theory 1 1.3 Objective 1 2 Apparatus and Supplies 1 3 Procedures 4 4 Equations 4 5 Experimental Results 5 6 Error Analysis 9 7 Conclusions 9 8 Recommendations for Further Studies 10 9 References 10 APPENDIX Table of Figures Figure 21: Pressure Differential Gauge Δp. 2 Figure 22: Weighing Tank with Dump Valve open. 3 Figure 23: Pressure Differential Gauge between Valve Set-up 3 Table 51: Constants and given values. 5 Table 52: Measured Data. 5 Table 53: Volumetric Flow, Velocity, Reynolds #, Head
References: Giles, Ranald V., Jack B. Evett, and Cheng Liu. Schaum 's Outline of Fluid Mechanics and Hydraulics. New York: McGraw-Hill, 2009. Print. Appendix