# Questions tagged [flow-control]

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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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### 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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### 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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### 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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### Explain pressures created by fluid flow through small orifices

So my question is in relation to fluid flow and pressure. In my pictures below you can see that i have two similar situations. Fluid flows in from a large reservoir at a constant rate through a ...
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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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### Reducing air flow speed without much backpressure

I am setting up a test-bed for an experiment. Here's what I have. A circular car exhaust like this Image The gas comes out of the exhaust at a velocity, x. We need to lower the gas velocity to X/3 ...
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### Looking for elegant ways to divert airflow

I am working on capturing air pollution particulate matter from Diesel Generators. Consider the following scenario. A 15KVA generator that outlets smoke from the exhaust The smoke goes into our ...
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### Flow rate into a reactor from feed

I have a fresh feed (stream 1) entering a reactor . This fresh feed consists 225kg/h of iso-butane , 225kg/h of butylenes and 50kg/h of n-butane . In the stream table I need to add in a flowrate ...
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### Can ultrasonic sound pass through solid medium?

For my electronic project, I have been searching the internet for a non invasive flow meter that does not require disassembly. I have found an ultrasonic measurement technique that use the clamp on ...
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### Alternatives to shimming valve springs

Generally, in a pressure drop control valve that uses a piston and a spring (for example, in jet engines to control fuel flow), there is always potential for error in terms of the height of the spring....
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### What is the purpose of these “steps” in rivers?

I have seen a number of structures within rivers, which resemble steps, and which allow the water to cascade down them instead of flowing naturally down the course of the river. Example 1: River ...
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### What specific characteristic of proportional solenoid valves makes the flow to current behavior quadratic?

If experimental data is obtained from a proportional solenoid valve, specifically flow vs current (assuming inlet pressure is constant), the fit is nearly quadratic in nature. Andersen's Analysis and ...
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### Best way to get rid of turbulent flows?

I am making a testing facility for pumps. This facility has to be able to handle 500 m3/h with at little turbulence as possible. The basin itself is 5 meters long, 2,5 meters wide and 2 meters tall. ...