Questions tagged [flow-control]
The flow-control tag has no usage guidance, but it has a tag wiki.
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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Design a manifold block and calculation of pressure drop
How to calculate pressure drop inside a manifold block with different pipe sizes for one connection to another. Overall the manifold block maximum working pressure is 10 bar. Can anyone send me basic ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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{\...
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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.
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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, ...
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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?
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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 = ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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.
...
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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 ...
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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, ...
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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....
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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 ...
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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 ...
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Buoyancy force problem
I'm trying to design a kind of water valve with inexpensive materials as a first prototype.
The water flow from the PVC pipe (1) reach the body of the valve and pass through an aluminum grid (3) to ...
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Established Patterns and Designs for Measuring Powder by Volume
I'm not a mechanical engineer so please be patient with my descriptions and question.
I am working on a design for a device that needs to measure out different amounts of powders by volume (not ...
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Layout of a controller for controlling a water pump
I'm currently writing a simulation environment in python/c for heat networks and got to the point where I'm implementing the controls for the environment.
The PID controller is already implemented and ...
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