Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum.It is usually measured as a liquid surface elevation, expressed in units of length, at the entrance (or bottom) of a piezometer. In an aquifer, it can be calculated from the depth to water in a piezometric well (a specialized water well), and given information of the piezometer's elevation and screen depth. Hydraulic head can similarly be measured in a column of water using a standpipe piezometer by measuring the height of the water surface in the tube relative to a common datum. The hydraulic head can be used to determine a hydraulic gradient between two or more points.
The pump has an outlet size of 4 inch
1) In case 1, 4 inch pipe is connected at length of 20 m
2) In case 2, 2 inch pipe is connected using reducer
In both cases the pump outlet conditions are same( having same flow rate at a given pressure)
What happens to pressure at the end of the pipe in...
I am trying to calculate head loss for a sloped pipe.
I found this calculation here, which seems to be what I want..or at least a start:
https://www.pumpsandsystems.com/pumps/april-2015-calculating-head-loss-pipeline
My confusion/skepticism arises from the fact that the equations in the above...
Hello everyone,
I am very interested in knowing the relation to determine the pressure required to push the water upstream.
In the attached picture, water is filled inside a tank of volume V and air is constantly flowing inside the tank through an inlet with constant flow rate M. Water should...
I am not really worried about the numbers, but more about the simple concepts with head loss in these pipe flow questions. I want to confirm that head loss just means the change in static head, right?
I have been advised that for a problem like this, it is nothing more than the conservation of...
Hi all,
Quick question:
What do you guys use as your reference for minor head loss coefficients (k).
I'm sure those with more experience have their own database/excels of k values found over the years. I have been personally using a combination of my Hydraulic Engineering Textbook and Google...
Hello! In an experiment (I don't have the details) the predicted head loss in a circuit of pump and pipes was higher as the flow rate increased, than the actual head loss (pressure differential). Can you tell me please what could result in that? What systematically acting factor created an...
Hello there. I took a test yesterday in my thermal fluids 1 class and I was hoping somebody could confirm or critique my answer. (Don't worry, I asked the professor first if I could take the picture)
The problem is:
Water is pumped from a lake to a pool through a 0.05 m diameter pipe. System...
Hi guys,
First post on this forum. Greetings from the Netherlands :)
I am currently in the process of designing a turbine used in locks in several canals. The turbine is powered when the lock chamber is being emptyed during the lockage.
The goal is to calculate the water level in the lock...
Homework Statement
why the author use major loss due to fluid friction is fL(Q^2) / 3(d^5) ?
according to darcy weisbech , the major loss due to friction has the formula of fL(v^2) / 2gD why the author wrote it as fL(Q^2) / 3(d^5) ?
I don't understand
Homework EquationsThe Attempt at a...
Homework Statement
I was told that for loss of head at entrance , the degree of contaction depends on how thick the pipe walls is .
i really don't know the meaning , can someone clarify ? the author also stated that the loss coefficients will vary , for very thin tubes , k is very high ?
head...
1. The problem statement, all variables and given/known
i am having problem of finding the major loss caused by pipe friction in this question. the formula of major loss is given by fL(V^2) / 2gD , how to get the total length of pipe so that i can gt the major head loss?
. Relevant equationsThe...
Calculate the head loss per metre length of a capillary tube which has a bore radius of 0.45 mm when a fluid of density 850 kg/m3 and viscosity of 25 cP is flowing at a rate of 50 l/hr. State whether the flow is turbulent or laminar.
I have attached my attempt at a solution using poiseuille's...
Homework Statement
See attached image:
Homework Equations
p/ρg + V^2/2g + z = constant
head loss (major) = f * l/D * V^2/2gThe Attempt at a Solution
To use the energy equation while incorporating head loss, I need to determine the velocity in each section of pipe. The problem is I don't know...
Homework Statement
estimate the energy head lost along a short length of pipe suddenly enlarging a diameter of 350mm to 700mm which discharges 0.7(m^-3) of water per second .
the solution given is Q1= Q2 = 0.7(m^3)/s
0.7 = pi ((350x10^-3)^2 ) V1 / 4 , V1= 7.28m/s
0.7 = pi ((700x10^-3)^2 ) V2 /...
Homework Statement
A venturi meter is being calibrated horizontally and has a diameter of 75mm at the entrance and 50mm at the throat . The flow rate is obtained by measuring the time required to collect certain amount of water . The average number of measurement gives 0.614m^3 of water in...
Homework Statement
,
There is an Head Loss question, two pipes join and expanding parts 30 degrees from the horizantal.
Homework Equations
The Attempt at a Solution
Before attemting a solution I try to understand what a1=a2=1.06 is?
Would you like to give some information about it...
Homework Statement
i know that the formula of head loss is (V^2) / 2g , where v =velocity , but , why did the author want to change it to k[(Q)^1/n ] ?
Homework EquationsThe Attempt at a Solution
Homework Statement
This is simply a sanity check concerning the system described and attached. My concerns are detailed within my attempts at the solution. Any guidance will be greatly appreciated!
The diagram attached represents a process for which a pump and associated pipe work require to...
Homework Statement
what does the gamma in the formula mean ? since the other terms in the formula are the same , i can just cancel it, leaving μ / γ = v /g . So , γ has unit of kg(m^-2)(s^-2) ?
Homework EquationsThe Attempt at a Solution
Hi, I just have a few questions on bernoullis equation dealing with power and head loss
If the equation for power is p = mass flow rate * g * Hloss, Then is g only used when let's say a pipe is at an elevation ?, because in my book I have an example where g is not used to calculate the power...
OK, So I have been having an on and off debate with my family about this. I saw a pump at Home Depot that said it has a 30 ft head. Then it went on to show that the flow rate varied as the output of the pump changed in height. Now I thought that this was wrong. I just finished a course in...
Hi,
I need clarification on the difference in head loss for turbulent flow and laminar flow. I understand how the head loss due to friction is different for the two regimes. For friction head loss, the friction factor is 64/Re for laminar flow, and a more complex formula for turbulent flow. I...
I have head loss (25.95ft) and converted that to pressure (17.19psi). I am trying to find flow rate in 3" sch 80 pipe coming from railcar at 25psi. So outlet pressure is 7.813psi. The fluid is 50% Caustic soda.
Homework Statement
I have three valve/coil systems connected in parallel as shown in the attached figure. If I know the head loss of each valve/coil is 40 feet, can I add them in parallel like you do with resistors in circuits?
Thanks!
Homework Equations
1/h=1/h1+1/h2+1/h3 (possibly)...
Water flows through a horizontal 150 mm diameter pipe with a mean velocity of 2.5m/s. The surface roughness of the pipe is 0.15mm. Determine the head loss in a 30m length of the pipe. Hints, use moody chart, Re = ρVD/μ.
Been having trouble with the question, can't seem to do it.
For minor losses, I read that the pressure drop is equal to the dynamic pressure * loss coefficient. However, in calculating dynamic pressure, it uses a single velocity. How do you determine this velocity when it will vary at the point of change in pipe diameter or direction? I have read...
I am working on a project at my summer internship rerouting some duct work and want to do some calculations to see how much changing some of the 90 degree angles in the duct will improve flow. I don't have my Fluids text with me and was wondering if anyone knew of any good references online to...
Homework Statement
I have to design a pumping system. Its for a swimming pool. The pool has various fittings (valves, etc) and pipe lengths. My problem is I cannot find an appropriate K value for the filter and sieve.
On the suction side of the pump is various valves and a sieve to...
how to calculate head loss due to sudden enlargement in case of compressible fluid?
hiiiiii guys, am graduate student, i want to know @ head loss in case of compressible fluid due to sudden enlargement...pls help me ...as soon as possible...
Homework Statement
Heated air at 1 atmosphere and 35 deg. Celsius is to be transported in a 150 meter long circular plastic duct (smooth) at a rate of 0.35 cubic meters/sec. If the head loss in the pipe is not to exceed 20 meters, determine the minimum diameter of the duct.
Homework...
Hi all,
I'm sure a lot of you know about the head loss due to sudden expansion:
Hl = (1/2g)*(v1-v2)^2
This equation can be derived from Bernoulli, continuity and momentum balans equations. The underlying assumption in deriving this equation is that the pressure just after the expansion...
Hey,
If you have 3 pipes of different diameter flowing into another.. what needs to be true for the head loss in the 3 pipes to all be equal?
ie Hf1 = Hf2 = Hf3
Cheers. :S
I was reading on this page...
http://www.cda.org.uk/megab2/build/pub125/sec4.htm#5.1
...and I tried calculating head loss using both the forumla given, and the nomogram. Aren't these supposed to give the same result? Or am I missing something fundemental? Because they don't equal each...
Hi. I'm trying to determine the flow rates of water in a pipe network. At a junction in a pipe, for example a simple y junction where the water heads out of a tap down a short length of tube before splitting into two lengths of tube of the same diameter, would the head loss equation for one of...