Questions tagged [fluid]

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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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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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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
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2 answers
101 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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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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2 votes
2 answers
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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 answer
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CFD numerical methods (FEA, FVM, FDM,…)

I just read the answer from this question and have a question please: What I read: Computational Fluid Dynamics (CFD) refers to the use of the numerical techniques to solve fluid dynamical problems. ...
James's user avatar
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2 answers
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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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2 answers
310 views

How can I calculate the pressure in a pipe?

I am an engineering student designing a pipe system for a fluid flow and I calculated everything including the pressure loss. Now I have to choose a pipe material and pipe thickness for the piping ...
Armis's user avatar
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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?
Sibila's user avatar
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How to achieve the choking condition at the orifice?

I have a geometry featuring two inlets. One inlet is designated for gaseous Ethylene, and the other is for gaseous Oxygen. During my computational analysis, I am unable to incorporate the complete ...
Mohammed Niyasdeen's user avatar
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1 answer
80 views

Effect of pipe size on water flow rate in municipal water system

am expanding my house and the town is requiring us to increase the size of the water line from the street from 3/4 inch to 1 inch diameter. intuitively i understand that a bigger pipe results in more ...
Seth Ness's user avatar
2 votes
1 answer
46 views

Where in a fluidic fitting does the seal form?

Kind of a basic question but I'm confused on where the seal is formed in a fluidic fitting (diagram below, source: Idex). I know as the nut is screwed in, the end of the ferrule contacts the receiving ...
Vivek's user avatar
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Split tubing assembly

I am designing a tubing (TPE) assembly that splits a single inlet line into either four or eight outlet lines. The goal is to achieve an approximately equal flow rate of mildly viscous liquid at each ...
biobuddy39's user avatar
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Optimal frequency for penetrating 1 meter of water using radio waves?

We are attempting to penetrate 1m of water featuring dissolved ions ( assume salinity of sea water) using radio waves. Aside for using wavelengths of very low frequency radio or below, what would be ...
Hypnos Stratagem's user avatar
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How can I anchor a rubber sheet that will be stretched?

I am designing a cylindrical container that will be filled with water. One end of the container will be solid with flow port and the other end will be a 3mm rubber sheet. I want to oscillate the ...
akz9's user avatar
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2 answers
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What is the theoretical explanation of flow work/energy?

Given the following definition of flow work: Reading and following the derivations I understand that in theory, this is only accurate when the fluid accelerates from rest. However, if we consider ...
cav3's user avatar
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How can I calculate the suction of an eductor?

I am very interested in eductors and want to know how to calculate the suction power of one. I know it involves equations from the venturi principle and also Bernoulli's equation, but I'm not sure how ...
SinJinQL's user avatar
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Pressure drop across orifice plate

I have been trying to estimate pressure loss caused by an orifice plate. The fluid flowing through it would be water. I found equations for discharge efficient and pressure loss coefficient K from ISO ...
Patrick F.'s user avatar
1 vote
1 answer
73 views

Why do axial compressor stages have to get smaller and smaller to increase fluid pressure?

Why can't we design axial compressor stages of which have the same length? We are adding kinetic energy to fluid and then get it back as potential energy-static pressure. So why do we need that they ...
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What pressure do objects at exhaust of pipes feel from flowing fluid? Dynamic or Total?

Let's imagine that we have one fluid source separated somewhere in two pipes of R1 and R2, and we put one object at exhaust of R1 pipe and one more object at exhaust of R2 pipe (R1 > R2). Let's ...
Jawel7's user avatar
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1 answer
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Does a disk placed in a pipe perpendicular to flow direction of fluid feel dynamic pressure or total pressure?

There are two discs in the pipe but not at the same time. You can consider conditions with X but without Y, then with Y and without X. I am pretty sure that disc X will feel less force from fluid than ...
Jawel7's user avatar
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1 answer
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What would be the flow rate of 5 L hydrogen at 20 bar being vented through a 1/4 inch (assumed smooth) stainless steel pipeline to standard pressure?

As the title says, I have a 1 m pipe network of 1/4 inch diameter connected to a 5 L bottle of 20 bar hydrogen. If this system was to open suddenly, what would be the volumetric flow rate out the ...
Sam's user avatar
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2 votes
2 answers
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Two Definitions of Kinematic Viscosity and it's Importance in Engine Oils

I have come across two definitions of kinematic viscosity and I am wondering about their relationship and significance in engine oils. One definition describes kinematic viscosity as momentum ...
MechaTrex's user avatar
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where should center of gravity of cargo for the entire structure to be JUST stable?

My work: My answer for 1 is 2.5m (floats) For 2: MG must be positive and Ym - Yg must be positive I am not sure where to go from here.
Sabe's user avatar
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1 answer
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Double Meniscus of Capillary Tube

I recently realized that if I turned my coffee cup downward, all the liquid spills out easily. This amazement prompted me to wonder about the impacts of surface tension for a situation in which the ...
Robla Tutopert's user avatar
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2 answers
45 views

Are there compressors that can compress both water and water vapor?

I noticed while reading about compressors that they have various types and are generally made for a specific function. However, are there types of compressors (or pumps) that can compress both water ...
Belal Bahaa's user avatar
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1 answer
28 views

Optimal maintenance temperature and allowable drop for energy efficient hot water storage

I bought an under-sink electric boiler/hot water storage unit, for instant almost-boiling water. This device has an 'eco' mode, which broadens its hysteresis to 10 degrees C: it will allow the stored ...
OJFord's user avatar
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2 answers
257 views

Flow through Pipe annulus with pressure controlled opening

I have a pipe with radius $R_1$ with a smaller pipe within (radius $R_2$). I want to find an expression for the flow through the pipe which flows in the annulus area. However, the known values are the ...
Nil's user avatar
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-2 votes
1 answer
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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 ...
DribbleNibble's user avatar
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1 answer
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Hydrostatic pressure on submerged surface

Can someone help me calculate the hydrostatic pressure on an immersed inclined body like the one in the figure? I know the force acting on the triangle is changing with height thus I can use an ...
Babar's user avatar
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2 answers
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Water pump's output going down

So I have a submersible pump (Which I do not use submerged but just connect hose to both ends) who's output is consistently falling. While guessing for the causes I am tempted to blame one instance ...
DribbleNibble's user avatar
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1 answer
53 views

Movement caused by buoyancy

I have a rod that can rotate about a point, the rotation is caused by the buoyancy of 3 balls connected to the rod as in the picture: I need to calculate the angle at different heights and the ...
Nil's user avatar
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1 vote
0 answers
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Entropy in Euler equations for compressible flows

In compressible Euler equations, everyone knows the energy equation can be written as $$ \dfrac{Ds}{Dt} =0 $$ which implies the entropy is constant along the path line. However, we have shockwave as a ...
ArtificiallyIntelligent's user avatar
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1 answer
63 views

Understanding continuity equation

The volume for an open tank is given: <$V = L \cdot L \cdot h(t)+ h(t)^2 \cdot tan(\theta)$> Where h is the volume of the liquid within the tank. I want to calculate the change in height as a ...
Nil's user avatar
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0 votes
1 answer
57 views

Submerged fraction buoancy force

How can I calculate the height of the submerged part of a partly filled bucket? (The liquid both inside and outside is freshwater). The bucket is trapezoidal such that the volume of the submerged can ...
KSH's user avatar
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0 votes
1 answer
53 views

Correct Hydraulic Symbol for Check Valve

I was looking in a few different hydraulic power textbooks for symbol information and I noticed that on of them referenced a check valve with this symbol: Is this "full" block symbol ever ...
Austin Fox's user avatar
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1 answer
42 views

How does decreasing the cross-sectional width of a channel impact steady flow?

The continuity equation states that for a constant mass flow rate, if the cross sectional area of a channel is decreased, then velocity is increased. What happens if the channel has high walls and is ...
ARJ's user avatar
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1 vote
1 answer
403 views

Is supersonic flow not possible in a venturi tube?

I'm trying to design a venturi tube that will have a pressure drop of 91525 Pascals where the inlet pressure is at 1 atm and the throat pressure is at 9800 Pascals. I calculated the minimum throat ...
Sir Dhaliwal's user avatar
0 votes
3 answers
103 views

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 ...
JSRambal's user avatar
4 votes
2 answers
441 views

Why do we need continuum approximation in fluid mechanics?

We know that a fluid in reality is not continuous. It has spaces and voids between atoms and molecules. Continuum approximation is a famous approximation that is taken in any fluid mechanics textbook. ...
Harshit Rajput's user avatar
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2 answers
98 views

How to solve transient heat conduction equation at a point in space with volumetric heat source?

My system is a fluid exposed to light and I want to calculate the temperature change with time at a point, hence there are no spatial effects or convection due to the flow of the fluid. The heat ...
Catridge40 keen's user avatar
1 vote
2 answers
1k views

Airflow visible over the airplane wing

What's that visible airflow over the airplane wing and what causes it?
MechaTrex's user avatar
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2 votes
0 answers
29 views

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 ...
Austin Fox's user avatar
0 votes
1 answer
32 views

What is a good working fluid in the temperature range of 150 - 180 °F?

I am looking for a good working fluid whose boiling point is in the range of 150 - 180 °F for a waste heat recovery system. The fluid should be minimally flammable, preferably nontoxic, and low in ...
Hypnos Stratagem's user avatar
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2 answers
151 views

Discharge at an angle in a channel concept question

Now I agree that the velocity of the discharge and the area is not at right angles, but I don't understand how using $\cos \theta$ helps? Shouldn't I use the area perpendicular to the channel? Like so:...
CountDOOKU's user avatar
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1 answer
132 views

Difference between Front Tracking and Front Capturing Method

I am having difficulty understanding the difference between interface capturing and interface tracking schemes. It is important to track it for solving Navier Stokes equation and other fluid problems ...
Bijay's user avatar
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1 vote
2 answers
351 views

Calculating pressure forces (vertical) on a curve surface

I am particularly confused about finding pressure forces (specifically vertical force) on a curve surface. Although I understand the general method is to use sum of forces in the x/y direction (ie by ...
CountDOOKU's user avatar
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0 answers
33 views

Can anyone help me solve this problem?

I am a bit confused with this because the channel is not infinite in the z direction. I know that I have to do some things with the Fourier expansion but I'm not sure how. Would be great if anyone ...
JLV_16's user avatar
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0 answers
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Effect of density of a fluid on laminar boundary layer thickness in external flow

We know that laminar boundary layer thickness depends on the distance from the leading edge and also characteristics of the fluid such as approach velocity, dynamic viscosity and density. I understand ...
user765016's user avatar