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Questions tagged [fluid-mechanics]

Questions relating to fluids at rest (fluid statics) or the forces and effects of fluids in motion (fluid dynamics).

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Flow in vent of a pipe

I have a horizontal pipe of diameter 2000mm (uniform cross section), the pressure of gas flowing in the pipe is 1.2bar and the flow velocity is 15m/sec. there is a 100mm diameter vertical vent ...
lakkadaayush's user avatar
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40 views

Temperature profile in a pipe flow with Matlab pdepe solver

I’m currently trying to solve the heat equation for the Ohmic heating of a pipe flow using the MATLAB pdepe solver. The problem is described in the following paper: https://doi.org/10.4236/ojmsi.2021....
arnaud2547's user avatar
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Index notation for the generalized form of the velocity field dependance on shear and rotation

Good day guys, I was studying fluid dynamics and came across the following equations (shown in the image): When we have both shear and and rotation, they each contribute to the change in velocity ...
RMS's user avatar
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2 answers
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are ducted fans better than turbines generating vaccum?

Basically I want to make a trap that sucks mosquitoes into a screen container for future studies, to do this I need to generate a vacuum and I need to choose whether to use a ducted fan (simpler) or ...
RHR's user avatar
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Momentum Diffusivity without Mass Diffusion in Liquids

I have been reading about the differences between momentum and mass diffusivity. I understand that mass diffusion occurs because of the "random walk" of individual molecules which over time ...
Nukesub's user avatar
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Calculating the convection coefficient of a green roof

as part of a course I have to calculate heat transfer through a green roof. I'm using Python to carry out an assessment over twenty years. The data I have are irradiance, wind speed, air temperature, ...
Héléna's user avatar
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35 views

What is the flow rate at pressure x when given these pressure drops?

I was given a work problem. There is a water pipe that has a leak. The leak appear very minor. Some staff decided to try and measure the leak after shutting the water off at both ends of the pipe. ...
Shane S's user avatar
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Pessure required for pumping seawater through pipe with inlet at a depth below sea level

I need to calculate the head capacity required at the pump, to pump sea water from a depth of 100m below sea level i.e. inlet is at 100m below sea level, the recieving end is at 5m above sea level. ...
manuel martin's user avatar
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Event tree for the failure of a buried crude oil pipeline

I am carrying out a quantitative risk assessment for crude oil pipeline I don't have a feel for the values of the data describing the pipeline system below(fluid properties, operating conditions, and ...
Kakashi's user avatar
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19 views

Is there a dimensionless number for wave guide width and frequency vs turn radius?

It seems like there should be a dimensionless number for wave guide width and frequency vs turn radius, but I have not been able to locate it or understand the proper application of one I am ...
ericnutsch's user avatar
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What are the boundary condition to simulate flow through vent mast?

Dear all, I am currently working on modeling compressible flows that occur when hydrogen needs to be evacuated (for purging, in case of fire, etc.). I am endeavoring to determine the appropriate ...
Dam's user avatar
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I want to find the energy capture from a submerged "waterwheel" type turbine with converging plating of 21 degree to form a ducted funnel

The inlet end would be 1.545 m wide x 1.170. The outlet to the flat turbine blades would be 0.806 m wide x 0.67 m and length would be 1.043.5 m. There are 8 x turbine plates of 0.415 m long x 0.67 ...
Ray Hinks's user avatar
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Spike in frequency domain in a dataset recorded using electromagnetic flow meter

I am trying to measure the water velocity of a stream along a channel using an electromagnetic flow meter at a specific location and depth. When I converted the data into frequency domain as power ...
Nicholas's user avatar
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1 answer
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Designing a tea strainer: Plastic vs stainless steel

Some time ago, I finished designing a tea strainer and I had a prototype printed from a certain heat resistant type of plastic (https://xometry.pro/de/materialien/standard-heat-resistant-pc-artig/) ...
Andrew Jackson's user avatar
1 vote
1 answer
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Formed Suction Intake - What is the purpose of splitting it?

Some FSI's appear to be split down the middle. Others appear to not have this split. What purpose does this component serve? Is this component ever serving the purpose of a structural support?
Adrian Beltran's user avatar
1 vote
1 answer
21 views

Seeking Manufacturing Advice: Low-Dose Powder Dosing Device

Hi everyone, I'm working on a project that requires a device to dispense a very small amount of powder (around 1 gram per second) in short bursts. Ideally, the device would "sneeze" the ...
100T's user avatar
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How do you calculate float speed?

My question is about fluid mechanics Based on and I understood correctly, buoyancy after release in still water becomes a constant velocity and based on my understanding correctly and the force acting ...
אור מרום's user avatar
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Dixon/Hall's "Fluid Mechanics and Thermodynamics of Turbomachinery" full of errors?

Note: This is no homework, but self-study. I have a thermodynamics and fluid mechanics background and am trying to work through this book in order to get better understanding of turbomachines (...
Felix's user avatar
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2 answers
56 views

Difference between pressure drop and vacuum

This is a question that has been haunting me my entire career. The pressure loss caused by friction is not the same as the pressure "loss" caused by vacuum, right? I mean, if I have a gas ...
lexax127's user avatar
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1 answer
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Can changing the topology of surface water initially hits change how much it splashes?

I am designing a crude funnel to feed into a portable dishwasher. I was not allowed to attach to water lines so I am stuck with pouring 1.5 large pitchers of water into it. I am designing a funnel to ...
CalebK's user avatar
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1 answer
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Is it possible to use two sets of stator blades after each set of rotor blades in an axial compressor?

I am currently designing an axial air compressor for a project, and I require the stator blades to reduce the velocity from 50m/s to 2.5 m/s in each stage of the stator. This requires a ratio of the ...
Manish S's user avatar
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Quantitative Risk Assessment Of Onshore Crude Oil Pipelines

I am currently working on a project that requires a quantitative risk assessment of a potential release (analysis of frequency and consequences) onshore pipelines transporting crude oil (underground). ...
Kakashi's user avatar
1 vote
1 answer
41 views

Why do wing-tip vortices cause an induced angle of attack upstream?

My question is the following. Wing-tip vortices induce a downward flow on the root side of the wing. So, if this induction happens at the wing, and these vortices are then shed downstream, why is ...
Armaan Mohammed's user avatar
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1 answer
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Why do trailing edge flaps increase the CL,max of a wing?

I was wondering why do trailing edge flaps increase the lift co-efficient for a given angle of attack. I am guessing it has something to do with delayed flow separation, but this is quite unintuitive, ...
Armaan Mohammed's user avatar
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20 views

Restrictor Nozzle Back Pressure

Using a flow restriction to create backpressure. The back pressure is very important as it is used to drive a piston. What nozzle/flow restrictor shape will create the highest pressure drop/back ...
Zach F's user avatar
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1 vote
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How Calculate Stored Potential Energy of Pressurized Water

This is a real-life question. I work in construction. Several engineers involved have come up with different answers. Which one is correct, and why? We are developing the plan to hydrotest a tunnel. ...
McLatchie's user avatar
1 vote
0 answers
35 views

Why is electroosmotic flow plug-like?

Hey, I am studying for a microfluidic exam and can't wrap my head around electro osmotic flow: why is the velocity profile plug-like? The fluid motion in the bulk phase away from the double layer is ...
Franz Görlich's user avatar
1 vote
2 answers
135 views

Trying to gain a deeper understanding of what a system curve (pressure vs flow) actually represents

I'm trying to make sense of what a system curve is, and I have three different conceptions in mind. Note: I don't have an engineering background, and these are relatively new concepts to me, so I may ...
spacediver's user avatar
2 votes
0 answers
67 views

Theory of rotationally symmetric air cushion vehicle

I am trying to develop a theory for this situation: A small blown-up balloon is attached to the center of a compact disc; you let it float as the balloon discharges. Simplifying assumptions: ...
r4r4's user avatar
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What are the forces acting on a rectangular polymer film submerged in a turbulent flow (stirred tank)?

I am new to research in fluid mechanics and for one of my experiments, I'd like your help. I need to write a force balance on a polymer film in a cylindrical tank at a fixed position. The film moves ...
flowcat's user avatar
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2 answers
103 views

Wind Load on conical structure

Is there a way to calculate the wind load acting on this conical cylinder? The wind pressure blowing through the hollow conical cylinder is at 30 bar. The conical cylinder is tilted at 10 degree ...
Matt's user avatar
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0 answers
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Centrifugal Compressor selection

I am currently trying to select a centrifugal compressor for a wind tunnel project. The requirement is that the flow velocity in the test section is Ma 0.1. The geometry of the wind tunnel has already ...
aziz's user avatar
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1 answer
51 views

Is there a shape that when submerged in a fluid is stable across all axis?

When placing a jar in a body of water an air bubble can be formed. If the air bubble is large enough forces are equal and the jar will be buoyant and float on the surface of the fluid (see fig. a). ...
Geoff Beamish's user avatar
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2 answers
76 views

Does it matter where a reduction happens in a fluid system to the amount of back pressure at the source?

I currently have an exhaust hood that produces a lot of back draft due to limitations of the ducting and a 4" diameter exhaust. The hood has a 7" circular output. It uses a reducer ...
cyboman's user avatar
1 vote
0 answers
45 views

How do I find the volume flow rate for a circular air duct?

My assumption to solve this problem is to find the average velocity on each circle then get the average velocity between the 1st and 2nd circle and then find the volume flow rate between circle 1 and ...
Youssef Mohamed's user avatar
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21 views

homework : torsors of constraints: Coulomb's laws

Bonjour , j’ai un devoir maison sur les torseurs mécaniques en lien avec la loi de Coulomb et Statiquecet je n’arrive pas à résoudre! Pouvez-vous m’aider s’il vous plaît?! Je met le sujet en photo ...
Julia's user avatar
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Overflowing water flow between two prisms

I have system as seen in the figure. The pump will supply constant volumetric flow rate and the water will fill the first rectangular prism. I couldnt find the water height after water starts to ...
Ali Akbaş's user avatar
1 vote
4 answers
265 views

Calculating reaction force of pipe elbow

I am currently studying for the mechanical FE exam. There is a problem in the fluid dynamics section that is not making sense to me. Problem statement: I solved it using momentum balance and I got 50....
remusconnor's user avatar
2 votes
2 answers
86 views

Why does Surface Tension Result in a Meniscus in a Tube

In learning about fluid mechanics and surface tension, we learned that in particularly large pressure differences between two fluids and a relatively small diameter, we see either a concave or convex ...
cav3's user avatar
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1 vote
3 answers
87 views

Reynolds Number Intuition

I've been searching yet haven't found any great intuition about what the Reynolds Number implies. Most people would characterize it as the measure of turbulence in a flow (usually defined by a ...
cav3's user avatar
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2 votes
0 answers
21 views

What is Drift flux in two phase flow (Fluid Mechanics)?

I recently started learning about two phase flows. While studying I came across relative velocity, drift velocity and drift flux. I understand the first two terms, but I don't understand the concept ...
Krishna Sai Kaligotla's user avatar
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0 answers
37 views

Which electrical portable fluid pumping actuators that aren't based on electric motors, combustion engines, or piezoelectric actuators?

So, basically, I'm trying to find a practical, electrical, portable and efficient alternative for hydraulic pumps that doens't use electric motors, combustion engines or piezoelectric actuators. The ...
Fulano's user avatar
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0 answers
39 views

How does a filter mesh/scotch-brite increase the thickness of the foam in foam spray?

On YouTube there are a lot of videos that show how to make a foam spray from a simple garden spray. One example you may see here: https://www.youtube.com/watch?v=kKUX5H7-xu0 (5:55 point is the most ...
user45323's user avatar
1 vote
2 answers
71 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
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0 answers
32 views

Understanding mesh for a cylinder

I came across this video on YouTube, and would like to know more about the mesh, such as the internal structure. Is there a reason to do it that way? Am i correct in saying there is an o-grid around ...
James's user avatar
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0 votes
1 answer
23 views

Designing a microwave based vacuum dehydration system

I am designing a Microwave based vacuum dehydration system for waste management sector and food dehydration. Currently I'm using a 3kw output 2.45GHz magnetron as heating element. My vacuum pump is an ...
Rohan Abraham Mathews's user avatar
0 votes
2 answers
219 views

How does stalled diffuser/wing reduce drag at F1 car?

How stalled diffuser/wing reduce drag at F1 car if in aerodynamics stall/separation is always related to increase in drag? Any graph of pressure distribution when diffuser is stalled? From "...
user707264's user avatar
1 vote
2 answers
59 views

How does an expansion valve cool fluid?

How does fluid loose temperature after leaving an expansion valve in a refrigeration cycle? Where does this heat go?
leoJ's user avatar
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0 votes
1 answer
55 views

Why does a surface integral have two integrals?

I am reading Modern Compressible Flow by John D. Anderson Jr and I am going through the integral form of the continuity equation, I am struggling to wrap my head around the fact that said form has two ...
Zeus's user avatar
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2 votes
0 answers
130 views

Astute-class submarine nose module shape

The nose module features a continuous ridge running along it's side. The rest of the hull has the typical "cigar" shape as other sub designs. (Q1) Does the "ridge" have a proper ...
Ionkz's user avatar
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