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What is the force of the water flowing vertically onto a paddle from a 20-mm diameter pipe and a flow rate of one liter per second and does the force double if the flow rate is doubled?
You need to know the distance from the pipe to the paddle to ascertain the velocity. Force = mass of water x square of the velocity assuming it is stopping at the paddle. The force would quadruple if it were following twice as fast since the force is proportional to the velocity squared.
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A hemi-spherical vessel has internal radius 0.5 m It is initially empty Water flows in at a constant rate of 1 liter per second Find an expression for the depth of the water after t seconds?
Since the vessel is hemispherical, its volume can be given by: V=((4/3)(pi)r3)/2 V=(2/3)(pi)r3 where r is the radius of the vessel. Since water is flowing into the vesse…l at a constant rate of 1 L/s, the volume of water in the vessel is thereby increasing at a constant rate of 1 L/s. By deriving the volume equation for the vessel with respect to time, we can equate the rate of change of the volume of water to the rate of change of the radius of the surface of water: dV/dt = (2/3)(pi)(3r2)(dr/dt) You must derive implicitly, so r3 derives down to 3r2(dr/dt) since the radius is also in itself a function of time. This equation can be cleaned up: dV/dt = 2(pi)r2(dr/dt) By solving for dr/dt, we get an expression for rate of change of the radius of the surface of water. dr/dt = (dV/dt)/(2(pi)r2) From the problem, we know that dV/dt is 1 L/s, and the radius of the hemisphere is a constant 0.5 m. We can substitute these known values into the equation: dr/dt = 1/(2(pi)(0.5)2) dr/dt = 2/pi This is the rate of change of the radius of the surface of water. The rate of change is a constant, which is important. Since it is constant, you can simply multiply this rate of change by a quantity of time to find the radius of the water level at any specific time. This is analogous to multiplying a constant velocity times a quantity of time to know an object's position at that time (a rate of change times an amount of change). We know that the vessel has an overall radius of 0.5 m, so the radius of the surface of water cannot exceed 0.5m. (dr/dt)= 2/pi therefore, depth at time t, D= 2t/pi This model gives the depth of the water (D) at any given time (t). As t increases, D(t) will return larger and larger values, which is expected since the water depth will increase as more water flows in.
When you know a required flow rate of a fluid with know viscosity through a pipe with known diameter how can you calculate the needed pressure to obtain this flow rate?
if u r talking about presuure drop then it can be easily calculate with the help of relation 4flv*v/2gd in that f is the friction factor which is different for vraious type …of flow for that u have to search a good book of fluid mechanics, v is the velocity. length of pipe and d is diameter of pipe
300mm is a very low head, you can't expect much flow through that pipe, but you can work it out from the mechanical energy balance equation.
Flow Rate Q= VA or V=Q/A. where q=flow rate, V= velocity, A=area.
Water flows through a circular pipe of internal diameter 3cm at a speed of 10 cms If the pipe is full how much water flows from the pipe in one minute?
Cross-sectional area of pipe is π(1.5)² = 7.07 cm² that means the flow is 10 cm/s x 7.07 cm² = 70.7 cm³/s 70.7 cm³/s x 60 sec = 4240 cm³ or 4.24 Liter
There are a lot more factors that must be considered in order to give you an accurate number, such as the length of pipe, type of pipe, number of valves in line, tees, elbows.… Water pressure will drop as the water flows along the line, and as it encounters turns, valves, tees, sprinklers, etc. I'll give you a rough estimate of 23 gpm, but this is an extremely rough estimate. You will need to figure out the complete layout with all valves, turns, sprinklers, etc, then consult an expert to get a better estimate.
30 litres per minute
Q = V*A Q is flow rate V is fluid velocity A is x-sectional Area
2.5 gallons per minute
This question is literally impossible to answer correctly because there is no given size or pressure of the liquid or gas travelling through it.
What is the difference between a single check valve and a double one and can you fit one in the hot water pipe to a shower to prevent cross flow.?
Answer A double check valve is merely two single check valves in close series. This means that under negative pressure the water that momentarily bypasses …the first check valve and causes it to close is stopped from going any further by the second stop valve which will close at exactly the same time (assuming no air or dirt in the valve and pipe). A single check valve stops backflow, but miniscule amounts of "contaminated" water will have passed back along the pipe before it closes. In theory two single check valves in series anywhere along a pressure pipe will act jointly as a double check valve, but the farther they are apart the more likely it is that something will act to stop them doing so. Possibly the shower maker has found it easier to adapt a design by using single check valves either side of the mixer instead of a DVC elsewhere, perhaps on the grounds of length of a DCV fitting. Because of the typical design of both types of check valve they can restrict forward flow rates noticeably, and you should only have them if you really need them. Now, the reason that double check valves are is there is purely to stop pollution of the mains - not your domestic cold water supply, and as such it is a complete con - the water network is raddled and full of cracks leaks and miscellaneous holes, from which about 20% of the water put into supply escapes. Therefore negative mains pressure (eg caused by a burst pipe downhill of you, or the fire brigade pumping water faster then the main can supply) will permit dirty groundwater to infitrate the mains pipe - possibly including road run-off, contaminated groundwater from industrial activities, or sewer leakage. The idea that public health is threatened by your shower dangling in the bath is cobblers, and as such you shouldn't be overly concerned about the arrangements, unless you really feel the need to comply with every detail of the Water Regs.
One inch diameter pipe with sixty PSI reading you would like to know what your water flow rate will be?
Well this is a very poor question as one would have to know the kind of piping material as there is friction losses to consider (Hazen Williams formula and Boyle's law)… then one should consider head loss if this is a vertical piping and finally are there other restrictions such as valves/ ells and or valves that are not full port such as globe pattern
This question is not specific enough to answer. If we knew which type of flow rate you were speaking of we could answer this. For example there is a volumetric flow rate w…hich is the volume of fluid that passes through any given surface per unit time.
With the information available, your question is unanswerable. The length of pipe,number and type of fittings and material( interior surface finish) must be known before the c…alculation can be made. Go to http://www.efunda.com/formulae/fluids/calc_pipe_friction.cfm and fill in all the blanks and the calculation will be made for you>
The simplest way to calculate the pipe diameter would be using flow rate & velocity in the formula, diameter=root((4*Flow)/(Pi*Velocity)). In order to find the velocity from… pressure we can use the formula Velocity=root(Pressure/1000).
I can not provide an estimate. In calculation of flow out of a pipe, more information would be needed. Since you have asked this under the category of the oil spill, I assume… you are asking what is the flow of oil out a vertical pipe, if the pressure at the bottom is 40,000 psi, and the diameter is 21". You need to specify the length of the pipe and all properties of the fluid. Since you are asking this in relation to the BP oil spill, gas will come out of solution as the oil is coming to the surface (or sea floor) making the calculations far from simple. There are a number of commercial pipe flow simulators. Again, for the BP spill, a team of scientists and engineers are using pipe flow simulation , if possible, and other methods to estimate the flow.