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Questions tagged [flow-control]

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Flow control valve understanding

I am trying to get a more intuitive understanding of incompressible fluid flow in valves. I understand the basics of Bernoulli's priciple and the energy involved with incompressible flows through ...
Austin Fox's user avatar
0 votes
0 answers
21 views

system curve with two different pumps

I’m trying to understand how to calculate a system curve that accounts for two different centrifugal pumps in parallel, each with a different fluid and different flow rate. These two lines will then ...
leo's user avatar
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1 vote
2 answers
68 views

How can I stop water flow in a hose after a certain water level?

I have a bucket that I want to fill with water only up to a certain level, the bucket is indoors, the first thing I thought of was a siphon like the one in a toilet but would prefer a smaller ...
user45316's user avatar
0 votes
1 answer
24 views

Operating a latching 24V DC valve with non-reversible current direction signal

Most 24V DC latching valves require a reversal of the current flow direction to be able to switch between open/close states. However, is there a way to operate them with a signal that can only go 0V ...
Noideas's user avatar
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0 answers
5 views

What happens when electrolytic process rotameters are swapped for a much bigger one?

electrolytic process rotameter were swapped for much bigger rotameters. Inlet pipes are the still the same. What effect does the bigger rotameter have in the concentration of catholyte in the cell?
Sibila's user avatar
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0 votes
1 answer
26 views

How is flowrate generated by a pump related to it's supply?

Let's imagine this situation https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTxrzyl_E9ig49eoN3MRO4EvmTI30cJ-BwTyA&usqp=CAU There is some hydrostatic pressure in the supply tank which causes ...
user1477107's user avatar
0 votes
0 answers
28 views

Control and capture free falling grains

I'm a rookie engineer with experience in Fusion 360 and eagle. I am trying to solve a huge problem I'm facing with respect to capturing 360 degree images of wheat grains that are free-falling. I have ...
RealRK's user avatar
  • 101
0 votes
2 answers
43 views

How to make a constant flow rate of water from a tank with a faucet at the bottom side?

Consider I have water tank as shown by the picture. By normal condition, the flow rate when the tank is full is higher than when the tank almost finish, and till it finally finish it will stop (in ...
AirCraft Lover's user avatar
0 votes
1 answer
27 views

How do these push-to-connect water filters activate water flow once pushed in?

I'm looking for a mechanism I can employ so that I can pull liquid containing bottles that are upside down out of a system, fill it, put the cap (with mechanism) back on. Then be able to turn the ...
Taako's user avatar
  • 107
1 vote
0 answers
35 views

A 40L compressed air cylinder at 100 bar is emptied in pulses at the rate of 41kg/s. How many such cycles would it take to empty the cylinder? [closed]

I am constructing a blowback gas system where clogged debris needs to be removed with compressed air using compressed air cylinder. 40L compressed air cylinder at 100bar pressure is available as ...
Yadunandan's user avatar
0 votes
0 answers
120 views

How to calculate the gas flow rate?

I am using a Venturi burner fed using a lpg cylinder. I need to calculate the gas flow rate? I am thinking of filling the gas in a balloon/fixed container can take the weight before and after to get ...
Amit Agarwal's user avatar
1 vote
0 answers
160 views

Why do Ejectors have a Venturi/Contraction?

Ejectors are flow devices that provide low back-pressure to a duct by passing a gas jet past the duct and taking advantage of the low pressure region this creates (See figure). A common usage of this ...
A McKelvy's user avatar
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-2 votes
1 answer
71 views

Calculate height of water column to keep tank with fixed drain rate constantly filled?

I would like to know how to calculate the height of a water source connected with a 1/2 inch hose to a tank that is constantly draining @600L/H, such that the tank would never empty, i.e, the rate of ...
DribbleNibble's user avatar
2 votes
0 answers
31 views

Consistent Fluid or powder flow through an orifice

This is a really odd and specific question, and I'm not sure this is even where to ask. A few weeks ago I thought about making a clock based on water flowing from an orifice. The obvious issue is that ...
Austin Fox's user avatar
0 votes
1 answer
58 views

Does a venturi cause strain on a pump

Excuse my terminology if it's wrong. I'd like to know if a venturi causes strain on a pump. For example, in my drawing. I have an air pump behind the house with a 50mm pipe fitting. On the other side ...
Frank's user avatar
  • 103
0 votes
0 answers
160 views

Effect of reducing pipe diameter at the outlet

I am pumping various chemicals (oils, resins and solvents) over a distance of up to 12 metres. The inlet and outlet points are at the same height. For the majority of the distance, the pipework will ...
Kendric Rendle-Short's user avatar
0 votes
2 answers
187 views

How to simulate open and close and control valve using a simple controller

I have successfully developed a mathematical model for my physical system. My objective is to control the mass of gas in and out of the system. The mass flowrate is given by: $V_f = C_d.\sqrt{2.\frac{\...
Tee's user avatar
  • 33
1 vote
0 answers
34 views

Gel Strength of water [closed]

I have been checking for the 10 seconds and 10 minutes gel Strength of water but has not seen any reasonable answer anywhere or maybe I have but don't understand.
Atoms's user avatar
  • 11
3 votes
3 answers
6k views

Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?

Given an orifice rated 1.8 GPM of water at 90 PSI, how do I calculate the flow rate at 30 PSI and what rating I would need to purchase to achieve 1.8 GPM at 30 PSI? Below added to give some context, ...
Pascal's user avatar
  • 161
2 votes
2 answers
54 views

Transfer of low density solids

Which sort of equipment is specifically designed for flowing/pumping low density solids (powders) e.g. for loading from a drum to a receiver?
Beerhunter's user avatar
0 votes
2 answers
209 views

Assessing flow rate from open sea into a container

I'm currently assessing sub sea pumped hydro capabilities, and need to use the flow rate in order to calculate power output. I can calculate the energy storage capacity using E = mgh: $E=mgh = ...
Kuriosity's user avatar
0 votes
1 answer
123 views

I want to determine the flow rate and required turbine size for an offshore hydroelectric scheme and need help

I'm creating a report on the possible implementation of a sub hydro system and need some help. I've attached the image of what I'm proposing, where I've essentially created a head via a riser B with a ...
Kuriosity's user avatar
1 vote
1 answer
93 views

Will decreasing a pump's flow rate decrease the NPSHR?

I have a small open hydraulic system and I simply need to circulate hot (85C) water from the bottom of a reservoir back into the top at ~4GPM. At its lowest point the system has only 3ft of static ...
Calin's user avatar
  • 11
1 vote
1 answer
632 views

Calculate mass flow rate of saturated fluid through pipe

Its very basic question. But there is no data all over internet about it. Let's see how we calculate mass flow rate through pipe. We take velocity of fluid and c/s area of pipe. Then we find volume ...
Niranjan Wagh's user avatar
2 votes
2 answers
74 views

How can I ensure steady flow to all the valves?

I've set this up for my hydroponics water distribution system. The water is pumped up, and is distributed via the valves. I can manual control the valves so that each outlet has a steady flow of ...
Methos's user avatar
  • 21
0 votes
2 answers
62 views

Would the volume of water usage change if we increase water pressure using a booster pump? Not changing pipe diameter, length or viscosity

This is for a clean up crew, I am wondering if we do not change our hose size, nozzle size on the sprayer. The pressure out of the water heater would be 65psi and they want to add a booster pump to ...
Mschlicht's user avatar
0 votes
2 answers
242 views

When designing a carburetor, is the air to fuel ratio calculated or just experimentally adjusted?

Does anyone actually calculate carburetors air to fuel ratio when designing one in practice? You would have to calculate the flowrate of air, the pressure drop, the rate of flow due to pressure ...
Francis L.'s user avatar
0 votes
3 answers
584 views

Liquid Level Control System Resistance

In the figure attached for reference, it is given that if $R_1$ is the resistance element of valve 1 and τ ∝ $R_1$, but I am not able to understand it intuitively. If $R_1$ is high, output flow ...
Surbhi Goel's user avatar
1 vote
1 answer
80 views

How can I measure the flow rate of CO2 gas from two different canisters?

I am looking for some help regarding one topic. I am designing one soda maker and thinking to include a 12g CO2 canister into it as my design only allows that size to incorporate . Now I know ...
Salmeen's user avatar
  • 11
0 votes
0 answers
48 views

Advice wanted on time to digital converters for speed of sound in fluids

I'm using the speed of sound to analyze the composition of aqueous solutions with sound velocities between around 1000 and 1400 meters per second. It's a process control application with continuous ...
Patrick Mitchell's user avatar
-1 votes
1 answer
142 views

Determine the length of the tube

I need to determine the size of the tube having the flow rate of the liquid (water) which is 5 ml/min and assuming the diameter of the tube is 4mm. How can i determine the size of the tube that takes ...
Physical's user avatar
1 vote
1 answer
74 views

Relative improvement in flow from diameter change with sub-milliimeter tubing

I want to calculate the improvement in flow rate that can be achieved with changing the tubing size when the tubing is sub-millimeter size. I originally approached this using a simplification of ...
CBRF23's user avatar
  • 363
2 votes
0 answers
49 views

When NOT to use Bessel's Correction for Standard Deviation

I can not find a clear explanation for when NOT to use Bessel's correction and use N instead of N-1. As I understand it, Bessel's correction would apply to things such as clinical trials, sampling ...
Justin's user avatar
  • 21
1 vote
2 answers
372 views

Proper Flow Meter Installation

I have a 12" flow meter that uses a float on a stem and whenever gas is supplied, the initial flow spikes the float to the top and gets wedged. The flow meter is plumbed downstream of a control valve ...
Steven S.'s user avatar
0 votes
1 answer
61 views

How can I confirm nL Volume Measurement for Pump and Sensor Calibration

I'm dispensing around 1uL of volume with 1% accuracy. Although I'm confident in my pump, I'd like to be able to routinely confirm that I'm getting the exact volume I'm requesting every time. How can ...
GrantG's user avatar
  • 3
1 vote
0 answers
24 views

Valve advice for chiller test rig

I am in the process of designing a chiller test rig, of which a very simplified diagram would be (the quick coupling might just be replaced by a non-return valve): I am struggling to find the type of ...
am304's user avatar
  • 1,831
1 vote
1 answer
120 views

Why doesn't steam/water flow backwards from expansion in power plant feedwater pump/boiler? [duplicate]

I think i understand the mechanics in a steam locomotive: Fill boiler with water Close off boiler Heat boiler until pressure is sufficient Keep boiler hot and use steam pressure until no more water ...
marko's user avatar
  • 11
1 vote
2 answers
362 views

Cheapest way to measure gas flow (mass)?

I understand that there are quite a few fairly simple and cheap methods to measure the flow of gas in terms of volume, allowing you to get a flow rate in terms of litres per minute for example. ...
PhysicsGuy123's user avatar
2 votes
2 answers
2k views

Do pressure regulators restrict the mass flow rate?

Suppose we have a tank containing compressed air. If a hole is made in the tank the air will start flowing out. The mass flow rate of exiting air will be heavily dependent on the diameter of the ...
Izak the coder's user avatar
1 vote
1 answer
149 views

Do you adjust gas flow rate (SCCM) to volume of chamber?

If I am carrying out a reaction by flowing 200 SCCM of a gas in a 20mm diameter pipe at 100mm length, if I change the pipe diameter to 10mm: Do I adjust the mass flow rate of the gases? If so, how do ...
Luck's user avatar
  • 13
0 votes
1 answer
143 views

Flow control experiment

In this flow control simple experiment in the lab, i am made to control the flow through the pipe and at the same time record down the output given by the sensor in voltage. I am told to record down ...
user185692's user avatar
0 votes
2 answers
61 views

Water loop with a drop output?

Hello everyone this project is for my aquarium. I have a big bucket beside it on the floor and I was planning on using it for the water changes. Will be a neocaridina shrimp breeding aquarium so my ...
Sofia Cortes's user avatar
1 vote
1 answer
51 views

Modeling Water Flow Through Saturated Medium

I am working on a project that uses a variable-speed pump to achieve a desired pressure across a medium (coffee grounds). The system includes a pressure sensor in-line between the pump and the medium. ...
e6r339b's user avatar
  • 85
3 votes
1 answer
561 views

Ideal funnel design for powders

I'm designing a funnel/bottle for a powder. My goal is to have all of the bottle's powder contents come out when inverted. However, the powder has a tendency to stick to itself (like flour or brown ...
Davbog's user avatar
  • 363
1 vote
1 answer
992 views

Gear pump has backflow and does not stop forced flow

I have a "Micropump GB-P25.JVS.A" gear pump. I pump in the range between 100 and 500 ml/min up to a column about 10 cm above the pump level. The column is filled from the top and has a bottom outlet. ...
Keine's user avatar
  • 141
0 votes
1 answer
703 views

Programming a gas mass flow controller rig

I'm trying to upgrade a multiple gas flow controller, which must be capable of controlling the mass flowrates of three gases independently through one outlet line to our system, and am in need of a ...
Oliver Walters's user avatar
0 votes
2 answers
58 views

What should be the density of a compressed gas while measuring the flow rate using Rotameter?

Say we have a required mass flow rate, in order to have equivalent volume flow rate, we need to consider density of the operating fluid (compressible fluid). To measure the volume flow rate in LPM, ...
Vasanth C's user avatar
  • 101
0 votes
2 answers
372 views

How does pressure drop occur across a pipe

Consider a pipe in which flow is taking place.A textbook says,when there is a valve or heat exchanger or resistance to flow between two points in this pipe,pressure decreases from one point to another....
Shwetha's user avatar
  • 97
0 votes
2 answers
1k views

How to control the level in multiple connected tanks at the same time?

In a coupled tanks system, what is the control strategy to simultaneously control the level in multiple tanks. In this case the actuators influence multiple control variables. The system is as shown ...
yaska's user avatar
  • 101
1 vote
2 answers
238 views

Pneumatic Can Crusher (Number of holes allowed for crushing plate)

Hi I'm designing a pneumatic can crusher for my course, and came across a problem. How many allowable holes would be ideal to relieve pressure on the crushing plate of the device? Are there ways to ...
soot's user avatar
  • 11