{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# rep - NOMENCLATURE Symbol m t v D Re f P l Cn Co vmax u Q...

This preview shows pages 1–6. Sign up to view the full content.

NOMENCLATURE Symbol Definition SI Units m t v D Re f P l C n C o v max u Q A n A o D n D o ΔP g Mass flow rate Time Average velocity Diameter of pipe Reynolds number Friction factor Pressure Inclıned manometer reading Correction factor of nozzle meter Correction factor of orifice meter Experimental maximum velocity Maximum velocity Volumetric flow rate Cross section area of nozzle meter Cross section area of orifice meter Diameter of nozzle meter Diameter of orifice meterPressre drop Gravitanional accelaration kg/s s m/s m Pa m m/s m/s m 3 /s m 2 m 2 m m Pa m/s 2 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Greek Symbols Definition SI Units α ρ μ ε Angle of inclined manometer Density viscosity roughness kg/m 3 N.s/m 2 mm 2
1.INTRODUCTION 1.1 U-TUBE MANOMETER U-tube manometer is one of the earliest pressure measuring device. It gives more accurate measurements and it is a simple device. As figure 1.1 shows U-tube manometer is a U-shaped glass tube partially filled with liquid. This manometer has no moving parts and requires no calibration. U-tube manometry measurements are functions of gravity and the liquid’s density. Liquid manometers measure differential pressure by balancing the weight of a liquid between two pressures. Light liquids such as water, CCl 4 can measure small pressure differences; mercury or other heavy liquids are used for large pressure differences. 4 2 1 CCl water h P h P γ γ × + = × + (1.1) 1 P 2 P water γ h 4 CCl γ Figure 1.1 U-tube manometer[Ref. ] 3

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1.2 ROTAMETER A rotameter is a type of flow meter which is also called as Variable area meter. It is composed of a tapered, transparent metering tube with a float inside, attached vertically to the pipe line. The fluid flows in meter from bottom to top, through the annular area between the float and the tube wall. Float starts to rise with the pushing force until the net force on it exerted by gravitational, buoyancy and drag forces, is zero. [Ref.3]   As the flow rate increases the movement of float would provide a higher flow area which helps to keep pressure drop nearly constant. The widest cross sectional area of the float indicates the height in the tube. Rotameter is calibrated with flow rate and the relation between the tube reading and flow rate is almost linear. Rotameters can be used for both liquids and gases. It is a simple device which is cheap and easy to set up but it can not be very useful for low flow rates. Figure 1.2 Rotameter[Ref. 5] 4
1.3 FLOW NOZZLE Nozzle meter is device which is used to measure flow rate. Bended plate which has a hole at middle is put inside pipe. This plate limits the flow of fluids. The operation principle is based on Bernoulli equation. With the help of plate, velocity of fluid increases because cross section area gets narrow. As velocity increases, pressure decreases. This pressure difference is measured by manometer. Flow rate can be calculated by pressure drop and cross section area. [Ref.1 ] Since narrowing in nozzle meter is not severe as orifice meter, there is a slight vena contract and less separated flow occurs. Nozzle meter is more close to ideal situation than orifice meter.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern