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In laminar flow, air resistance is proportional to velocity of the body whereas in turbulent flow, air resistance is proportional to (velocity)2.
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∙ 13y ago
Anonymous
It could be either turbulent or laminar depending on the fluid velocity, its density, its viscosity and the size of the venturi. Whether a flow is turbulent or laminar can be predicted fairly well by calculation of the Reynold's number (see Wiki for discussion of Reynold's number in pipe of diameter D as this applies to venturis as well).
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What is turbulent vs laminar flow?
An air plane wing or anything that reduces drag like an arrow,dart, or even fish. Other examples could be the fins of dolphins, blood through arteries, water in a tube. Just remember that laminar flow is flow in which the fluid flows smoothly without much resistance. The fluid pretty much travels in straight or almost straight lines.
What is the operating principle of the venturi meter of flow measurement?
Air flowing quickly over the open top of a vertical tube lowers the air pressure in it. This causes liquid in the tube to rise. (It rises due to the higher pressure acting on the other end. The tube is marked to indicate the wind speed. Alternatively, if the open vertical tube is in still air and it is connected at its lower end with a horizontal tube containing a flowing liquid, the liquid in the vertical tube will fall when the horizontal flow past the lower end increases.
Why might the left side of your Weber gas grill be hotter than the right?
Can't help but wonder if it was always this way. It is improbable that there is a problem with the valves, but there might be. The heart of the flow control, other than the valve, is the actual jet in the gas outflow to the venturi. Let's look at that. There is an insert, a jet, in each venturi mouth that has a hole of fixed dimension in it. When the burner control valve is fully open, it is this jet that sets a limit on the maximum gas flow into the venturi, where the gas and air are mixed before being fed through the tube to the burner head. Bugs can sometimes set up shop in there during a BBQ's "off season" if it has one. Make sure the jet and venturi are clean and clear.
Is the relationship between the fluid flow rate and the flow tube radius linear or exponential?
exponential
How does fluid flow tube length affect fluid flow?
in many different ways in connection with the thickness of the blood,
What is Working principle of venturi tube?
Venturi tube is used to for flow measurement. It work on the principle of Bernoulli Equation.
What is turbulent vs laminar flow?
An air plane wing or anything that reduces drag like an arrow,dart, or even fish. Other examples could be the fins of dolphins, blood through arteries, water in a tube. Just remember that laminar flow is flow in which the fluid flows smoothly without much resistance. The fluid pretty much travels in straight or almost straight lines.
What is the maximum value of Reynolds number for laminar flow of air?
The transition between laminar and turbulent flow occurs not at a specific value of the Reynolds number but in a range usually beginning between 1,000 to 2,000 and extending upward to between 3,000 and 5,000.
What can the term Venturi refer to?
There are many things the term 'Venturi' may reference. One possible use of the word would be a term used to describe a short piece of tube used to measure flow rate.
Were is the two main sections of a carburetor?
The float bowl and the venturi tube
How do you calculated throat diameter for venturi tube?
Using Bernouli's Equation.
What is the operating principle of the venturi meter of flow measurement?
Air flowing quickly over the open top of a vertical tube lowers the air pressure in it. This causes liquid in the tube to rise. (It rises due to the higher pressure acting on the other end. The tube is marked to indicate the wind speed. Alternatively, if the open vertical tube is in still air and it is connected at its lower end with a horizontal tube containing a flowing liquid, the liquid in the vertical tube will fall when the horizontal flow past the lower end increases.
What has the author Redfield W Allen written?
Redfield W. Allen has written: 'Measurements of friction and local heat transfer for turbulent flow of a variable property fluid - water - in a uniformly heated tube'
Do all shallow well jet pumps use a venturi tube?
All shallow well jet pumps use an ejector (or jet), which consists of a nozzle and venturi tube. Centrifugal pumps on the other hand are also shallow well pumps without a jet.
Why might the left side of your Weber gas grill be hotter than the right?
Can't help but wonder if it was always this way. It is improbable that there is a problem with the valves, but there might be. The heart of the flow control, other than the valve, is the actual jet in the gas outflow to the venturi. Let's look at that. There is an insert, a jet, in each venturi mouth that has a hole of fixed dimension in it. When the burner control valve is fully open, it is this jet that sets a limit on the maximum gas flow into the venturi, where the gas and air are mixed before being fed through the tube to the burner head. Bugs can sometimes set up shop in there during a BBQ's "off season" if it has one. Make sure the jet and venturi are clean and clear.
What is venturitube?
a short tube inserted into a pipeline and used to measure the quantity of a liquid that is flowing in the pipeline well this is a venturi tube. this is probably the same as venturitube. hope that's ok....
Working principle of venturi meter?
The differential producing flowmeter or Venturi has a long history of uses in many applications. Due to its simplicity and dependability, the Venturi is among the most common flowmeters. With no moving parts or abrupt flow restrictions, the Venturi can measure fluid flowrates with a minimal total pressure loss.The principle behind the operation of the Venturi flowmeter is the Bernoulli effect. The Venturi measures a fluid's flowrate by reducing the cross sectional flow area in the flow path and generating a pressure difference. After the pressure difference is generated, the fluid is passed through a pressure recovery exit section where up to 80% of the differential pressure generated at the throat is recovered. The pressure differential follows Bernoulli's Equation.Bernoulli's Equation:The Venturi PrincipleIn the illustration above, the fluid, either liquid or gaseous, enters the Venturi at the location with a cross-sectional area A1, pressure P1, and velocity v1. These properties form the potential and kinetic energy of the fluid at one location. Energy is conserved in a closed system, that is, the sum of potential and kinetic energy at one location must equal the sum of the potential and kinetic energy at any another location in the system. If potential energy decreases at one location, the kinetic energy must proportionally increase at that location. The fluid now enters the throat of the Venturi with a new area A2, which is smaller than A1. In a closed system mass can be neither created nor destroyed (law of conservation of mass, simply, what goes in, must come out), and as such, the volumetric flowrate at area A1 must equal the volumetric flowrate at area A2. If the area at location A2 is smaller than A1, the fluid must travel faster to maintain the same volumetric flowrate. This increase in velocity results in a decrease in pressure which follows Bernoulli's equation. The result: by knowing the pressure and cross-sectional area at two locations, one can calculate the velocity of the fluid. With the velocity of the fluid and its density, one can calculate the flowrate.A Venturi requires two pressure and one temperature measurement to accurately determine flow. The first pressure is measured at the Venturi's upstream location, P1. This is used for the density calculation and the high side input to the differential pressure measurement.The Venturi FlowmeterThe second pressure is measured at the Venturi's throat, P2. This is connected to the low side of the differential pressure gauge to form the DP pressure measurement. The temperature reading is taken several pipe diameters in length upstream of the Venturi so as not to disrupt the uniform flow profile.With proper instrumentation and flow conditioning, a Venturi's flowrate can be reduced to about 10% of its full scale range without adding multiple transducer configurations. This provides a 10 to 1 turn-down in a Venturi's flow range, For example: If a Venturi is designed for a maximum flow of 50 SCFM, approximately 5 SCFM would be the lowest value readable but there are compromises. See Instrumentation for a detailed discussion on instrumenting venturi flowmeters and how to maximize the measurement accuracy.Applications:Installation Requirements for Venturi Flowmeters:1) 10-20 diameters in length of straight pipe upstream of the Venturi2) 5 diameters in length of straight pipe downstream of the Venturi3) Flow conditioning tube before the Venturi, if the flow is non-uniform or swirlingFree Flow System This arrangement is probably the most common, allowing the Venturi to be installed at any point within the flowing system. The location is generally selected for installation convenience and best flow conditioning. Flow conditioning is necessary to minimize swirling and non-uniform flow profiles such as patterns created by fittings, regulators, and any other flow affecting devices.Pressure Reducing Flow System A Venturi can be installed at several different locations within a pressure reducing flow system. Each location generally has advantages and disadvantages. In the diagram below, two locations are shown for the Venturi's location. Location A is in the high pressure supply line to the system. Location B is after the pressure regulator has substantially reduced the flowing pressure and density. Because of the higher gas density at location A, the Venturi will have a greater flow range than at the lower pressure location B. However, this greater range comes at the cost of lower signal resolution as compared with location B. This would be similar to measuring the accuracy of a clock by timing either the minute hand or the second hand. Both clock hands carry the same accuracy information, the timing of the clock, but it would be much easier to measure the movement of the second hand versus the movement of the minute hand over a small time period. This is because the second hand has higher resolution, that is, it's easier to see a change in movement of the second hand versus a change in movement of the minute hand. If a greater time range is required, then one would need to measure the minute hand. It is the same with the Venturi's location. Some flow systems may only operate over a relatively small range. In that case, location B would be more advantageous than location A, and a properly sized Venturi at that location would provide the best signal resolution and accuracy. However, if measuring the full flow range of the system is required, then location A is the proper configuration. It is tempting to size a Venturi to measure the full air supply flow range, but, if it is only operated over a small flow range, this wide range comes at the cost of lower signal resolution and lower measurement accuracy. Require the Venturi to measure only the range that you need.Free Standing Inlet System A Venturi can be installed as the inlet component to a flow system. This arrangement is often used as a calibration standard for a CVS (Constant Volume System) flow stand in emissions testing. Venturis used in this application are referred to as SAOs (Smooth Approach Orifice). SAOs have several advantages over LFEs (Laminar Flow Elements), also used in this application. SAOs are calibrated to an accuracy level which is expressed in percent of reading. LFEs are calibrated typically to percent of full scale. This is very advantageous at mid range and lower flow rates, the error being a percent of reading not of full scale. As with Sonic Nozzles, Venturis (SAOs) will retain their original calibration accuracy unless they are physically damaged or abused. The stainless steel or anodized aluminum surface will not erode through normal everyday use with clean air.
