Questions tagged [pressure]

Questions pertaining to pressurized systems and their applications, from containment to system losses to using as a benchmark for measurement.

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Pressure used in printing processes

I am struggling to find numerical values for the pressure used in currently relevant industrial printing processes: relief printing flexography intaglio offset screen printing The most I found were ...
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Help needed understanding atmospheric tank vent physics principals

I try not to be a complete moron but am not an engineer so please bear with me. I have this LP record ultrasonic cleaner system that uses a solution stored in a "tank" which is a simple ...
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How exactly does a tire hold up its internal metal wheel against gravity?

This question isn't about how the tire holds weight up against the ground based on its contact patch, I understand that. It's about what's happening inside the tire such that the wheel (the metal hub ...
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Are there hydraulically actuated pneumatic valves?

I am working on a hydraulic system that is powered by an air-hydraulic piston pump, the pump uses pneumatic pressure to drive a piston which then pressurizes the hydraulic system. The system needs to ...
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pressure difference across injection and extraction in soil

We have a tank of dimension 100cm *100cm *5 cm( assuming 1D flow) which is filled with saturated sand and 5 cm of water standing above the soil. We inject fluid ( which is same as water in density and ...
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How to estimate pressure against a wall of a non-liquid like wood pellets?

For the creation of a wood pellet silo, I need to calculate the required resistance of the walls to support the lateral pressure: Let suppose a silo of $W * L * H$ full of wood pellets. Let suppose ...
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How to calculate leak rate from pressure drop in a pressurised vessel

I am currently trying to work out a way to calculate the leak rate from a pressurised container filled with water. I know the volume of the container/vessel and I know the pressure drop over a certain ...
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Is there a pressure check valve that doesn't bleed the excess pressure?

My issue is that downstream, I have a boiler making pressure at 10.54 bar and upstream I have a system that must NOT be heated at any point beyond 130 °C. My plan is to make sure the system pressure ...
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Question about cooling load, superheat, sensing bulb and the method that decrease the pressure in the thermostatic expansion valves

I must say I am the new guy in the engineering, so there are some proper noun or common sense I don't understand, hoping someone can teach me, I have two questions below: I have searched for ...
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Converting differential pressure

I need to submit a lab report. I've measured: Differential pressure [Volts] Flow rate [Hz] Flow Rate [m^3/s] In my report I need to get the Pressure Differential in Pascal but how can I convert ...
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What kind of pressure / strain gauge is this?

This is a photo of the backside of a diaphragm strain measurement element. I'm researching strain gauge operating principles, and the one shown below is eluding me. This is not a resistive strain ...
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best way to seal 5mm pipe?

I'm working on a personal hobby extending the reach of my pressure sprayer, I'm using 5mm pipe to connect it all together, the issue I'm running into is once I start pumping pressure up, the little ...
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Pressing a fluid onto a structure in ANSYS Fluent

I have a spefific problem which I tried to solve with Ansys Fluent and Transient Structural but I did not manage to get a solution so far. I am happy for any kind of help. I want to press a block of ...
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How can I reduce the air pressure in a rubber hose by a certain percentage?

Washing machines stop filling with water when air pressure in a hose reaches a certain point. The bottom of the hose is attached to the bottom of the tub. On older machines the top of the hose is ...
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What tool (numerical/simulation) can help me with this problem on liquid/gaseous nitrogen in a cylinder?

I hope everyone's doing well. I was wondering what kind of tools (numerical/simulation, and perhaps the corresponding equations as well) can help me model this problem of liquid/gaseous nitrogen in a ...
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Calculating the leakage of water in a pressurized vessel based on initial and final pressures?

Let's say you have a piping system containing liquid water under high pressure. One section of the pipe of ~70L gets isolated, and it is initially at the same pressure as when it was isolated, which ...
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How do I know if I can cut pressure sensors into different shapes?

I am building an imaging platform that requires the application of two pressure sensors shaped into a "hollow" semi-circle, pretty much C-shaped. To do this, I thought of buying the ...
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How to connect a 1/4 NPT pressure gauge to a schrader valve while being airtight

I need to attach this pressure gauge - https://www.amazon.co.uk/gp/product/B07CXM3ZGT/ref=ask_ql_qh_dp_hza - to a schrader valve with a pipe to measure the pressure. The valve has a 1/4 NPT thread. I ...
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Direction of tube when measuring air flow

When doing pitot tube measurements, the pressure is measured in 2 places. At the wall (A), for the static pressure and against the flow (B), for dynamic pressure. Where the difference between these ...
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Analyzing the term $\frac{1}{c_s^2}\frac{dP}{dz}$ for atmospheric phenomena?

Some background I am reading through a textbook on atmospheric fluid dynamics. The author is discussing something called the Boussinesq relations, and eventually the following expression arises: $$ \...
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How (mathematically) does pressure in the intake manifold vary based on size of throttle opening?

I have the intuitive picture somewhat down: the intake manifold is partially opened; during the intake stroke of a four-stroke process, the piston moves rapidly moves downwards creating a short-term ...
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Analytical / Experimental calculation of pressure loss for simple crossflow of air across a simple cylinder

I need a way to find pressure loss of air flowing across a single tube for both laminar and turbulent flows. I have referred to several sources (Y. Cengel Heat and Mass Transfer and Fluid Dynamics ...
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Velocity of blocks under different situations

Height of all blocks is 100m. CASE 1: Blocks are at a distance of 100m in height. When they reach the ground , velocity of 1st block must be higher than velocity of second block due to the extra ...
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What aerodynamic equation should be used to determine the drop in air pressure over an airfoil embedded within a vertical pipe?

I have a conceptual idea for a thruster for a VTOL aircraft/drone which should produce lift by utilizing a upward-flowing airflow to produce low air pressure over the top surface of an airfoil that is ...
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Are you able to compute the bending moment exerted on the inner edges of parallelepiped box under inner pressure?

Suppose you have a parallelepiped box of dimensions $a\times b\times L$ with $L\gg (a+b)$, filled with simple distilled water exerting a uniform and constant inner pressure $p$ as reported in figure. ...
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Will water flow into a tank connected to a hole in a pipe?

Consider water flowing through a pipe from a pump to an outlet at atmospheric pressure. The pipe has a hole in the bottom which initially connects to an empty tank. The water fills the tank. Once ...
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What is the pressure of air trapped in glass of water turned upside down?

Consider filling a glass partially with water, covering it with a solid non-porous plate and then turning it upside down. The plate is not hinged to the glass. There is always some air trapped in the ...
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Do we allow mass and moment of the footing itself, when calculating ground support and eccentricity of a footing?

Suppose we are designing a footing for the wall of a building. There are two checks that are crucial. Ground support: suppose the ground is assessed as being suitable to load up to 80 kN/m2. Then a ...
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Relief valve for "semi-closed" loop system (non-engineer warning :-)

My excuses in advance for the probably-bad wording of the question, I'm just an hobbyist without much knowledge in engineering. To the point I can't google for information on my problem since I don't ...
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Why does pressure gauge/pump reading drop when the valve is open?

I just used a simple car tire air pump with a gauge like the one in the picture. The device has a handle, a gauge and a button. Squeezing the handle fills the tire with air, and the button releases it....
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What is the difference between a 100 USD professional pitot tube and a 5 USD hobbyist pitot tube?

I would like to measure air flow speeds in a duct system for dust collection in a workshop. Relevant air speeds in the ducts are around 10-30 m/s. The ducts are circular tubes with a diameter of 160 ...
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Increasing air velocity through F1 car diffuser

I am looking into F1 car aerodynamics for a course that I am taking. I understand that because of Bernoulli's law, when the velocity increases, the pressure decreases, which is good for F1 cars if we ...
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Pressure variation through reduction (Bernoulli) and pipe wall design

Let's say I have a pipe followed by a reduction and then another smaller diameter pipe continues. Using conservation of mass, the flow through the smaller diameter pipe will have higher velocity. If I ...
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How to calculate the pressure applied in a compressible fluid?

If I am trying to figure the pressure needed contain a fluid like hydrogen in a cylindrical tank, how would calculating this go on? As Hydrogen is compressible to a differing amount than other ...
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Is it possible to calculate the strains applied by a force on a molecule? [closed]

This question was originally in the Physics site, but the moderator believed it was better suited for this site. Hence, I am following the advice. Is it feasible to obtain the modulus of elasticity ...
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How do vacuum sealers work on a glass jar?

I came across this video and I don't understand how a vacuum sealer works on a sealed glass jar. In the video, you can see the glass jars are closed tightly with a lid. In this case, how does the air ...
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How to withdraw liquid out of a injector in a pressurized autoclave?

I am using a hand spindle press to inject liquid into a pressurized autoclave through a stainless steel pipe. I was wondering is there any possible way to retrieve all of the remaining liquid out of ...
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What Is The Rectangular Pipe Structure/Loop Constructed To Reduce HighRise Water Supply Pressure DownStream From Roof Tank?

This Pipe Loops installed in series downstream from highrise rooftop storage tank should serve to reduce Water Pressure supplied to lower-floor households. I tried all kinds of Google Search terms, ...
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Q: Could you siphon an 10 meter tall water column?

This question might be better suited for this stack. In the physics stack, I posted about a question about siphoning. https://physics.stackexchange.com/q/677102/259268 An 10 meter tall cylinder is ...
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Is there any way to quantify the rate at which pressure is relieved in a reactor?

If a pressure relief valve is open, is it somehow possible to quantify the rate at which the pressure in the reactor will decrease?
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Sampling System Line Flow Rate

I'm an application engineer for sampling system products. Currently, one of my customers wants to measure their gas sample composition and create a new sample system to achieve it. They don't have any ...
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Water dynamics in aluminum pipeline for dummies

This topic is totally alien to me, so I may be asking something very obvious. I am designing a cooling system. In the bulk of aluminum, I drill 3mm holes and then I connect them one to another to ...
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Water flow rate generated by a pressure steam tank

I have a 5 $m^3$ capacity tank that generates steam with a heat exchanger. This tank is under 15 bar pressure. The water in the bottom part of the tank does not completely vaporize because there is ...
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Pv Diagram of a pressure cooker

For a bit of self training in thermodynamics, I've been trying to think of some random systems and go ahead and try to solve them, some of these things I've stolen from random googling of university ...
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What will be the force F for the given brake system?

I am getting two ways to find F. One is Fx0.2=30 Nm which gives F=150N Other is Fx0.2-640x0.13=0 which gives F=416N I am confused which one is incorrect. I know problem is too basic but still not ...
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Why is pressure in a common rail fuel system so much higher than in an air compressor or supercharger?

Superchargers in cars are bulky, expensive, consume considerable amount of engine's power and yet they generate only about 6-9 psi boost. On the other hand, modern common rail diesel engines inject ...
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Controlling flow through an output pipe

I wish to limit my flow through the output to a certain exact value. In this case to 10 lpm, what method or valve can I use to this task? At the moment the flow keeps on fluctuating between 10.1-11.2 (...
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In a high pressure water pump what component or design parameter increases pressure output, let's say from 200 atm o 2000 atm?

type of flow? length or diameter of the plunger piston?, or weight of the piston and crankshaft and torque or HP to move it?, or RPM. direct drive pumps used in waterjet cutting use a slim plunger ...
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How to design stiff plastic sheet

I am making a cylinder of polypropylene that must be pressurized (2 bar). The rough dimensions of the current design (A) are 7 cm tall, 5 cm in diameter, and wall thickness of 1-2 mm. The issue is ...
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Why is a throttling valve isenthalpic whilst a nozzle is not?

From my understanding, Nozzle's and throttling valve are devices which both trade pressure for velocity, so they increase velocity at the expense of having to decrease the pressure. If we examine ...

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