Questions tagged [flow-control]

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14 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?
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88 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 = ...
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1answer
58 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 ...
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1answer
17 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 ...
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1answer
37 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 ...
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2answers
58 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 ...
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24 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 ...
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2answers
40 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 ...
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3answers
47 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 ...
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1answer
16 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 ...
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47 views

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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34 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 ...
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1answer
45 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 ...
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1answer
18 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 ...
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0answers
19 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 ...
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2answers
35 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 ...
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1answer
39 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 ...
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0answers
19 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 ...
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1answer
44 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 ...
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2answers
190 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. ...
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2answers
622 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 ...
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1answer
56 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 ...
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1answer
62 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 ...
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2answers
54 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 ...
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1answer
44 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. ...
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1answer
169 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 ...
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1answer
353 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. ...
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1answer
434 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 ...
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2answers
52 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, ...
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2answers
159 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....
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2answers
417 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 ...
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2answers
199 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 ...
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2answers
495 views

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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1answer
36 views

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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1answer
115 views

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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1answer
162 views

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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1answer
132 views

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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1answer
85 views

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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1answer
212 views

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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1answer
85 views

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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0answers
79 views

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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2answers
217 views

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. ...
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3answers
268 views

Could a water stream be used as a fiber optic sensor and detect when the stream is broken?

I have a small idea/project I am working on in which I want to use a water fiber optic sensor that can detect whether the water stream is broken and if so shut off the water. Having looked into fiber ...
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2answers
561 views

How to determine whether a particular velocity vector will result in a laminar flow?

Lets take the substance to be water. To my knowledge , the only condition imposed on a velocity profile to distinguish between laminar and turbulent force is the Reynold's number. For lets say I have ...
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6k views

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 ...