Flow Definition and 1000 Threads

1. Johns Inc.has just ended the calendar year making a sale in the amount of \$10,000 of merchandise purchased during the year at a total cost of \$7,000. Although the firm paid in full the merchandise during the year. it has yet to collect at year end from the customer. The net profit and cash...

Homework Statement In this question , it's stated that the horizontal scale is sqrt(kx / kz) X vertical scale ... i think the author's is wrong for horizontal scale and vertical scale in example 8.3... Homework EquationsThe Attempt at a Solution I think the vertcal scale should be 6.1m , as...

Hi guys, I've been working through some notes on Transport Phenomena by Bird and I've basically been just developing velocity and shear stress profiles for various (simple) models by a differential momentum balance and I'm trying to understand why a certain result happens. When looking at...

Hello Homework Statement Lets say i have the given parameters: air volume flow : V = 36 m3/h Relative humidity: RH=33% air mixing ratio : X = 5.5 (1g H2O) / 1kg (DRY AIR) (calculated from RH) air temperature : T= 20 C So i know how much mass of water is the air compared to the air's "dry air"...

Greeting . It is clear to me that the resistor represents a physical obstruction to the passing current I do not know how exactly it works and I will try to show what I was really interested in the diagram.

It seems there must be a way, but I cannot seem to wrap my head around it. Here's the scenario... I have a 24" line flowing with a wet gas (combustion flue gas) into a dryer. It comes in at 90 degrees F, at a rate of 180 SCF/M. It leaves the dryer at 73 degrees F at a rate of 124...

I am looking for a graduate level textbook that would sufficiently describe the two phase flow characteristics during flow boiling. What textbook could I use to explore this topic? Is a graduate level forced convection going to cover two phase flow?

Hi everyone, I would like to know how to calculate the diameter of a pipe when we know the desired mass flow, the gas type, and the pressure at both end. I have these requirements : Gas : O2 Molecular weight : 0.032 [kg / mol] Desired mass flow : 0.32 [kg / s] Pressure in the gas tank : p1 =...

Homework Statement In the 3rd pictures , it's stated that q ( flow rate) = vA = kiA , so , i = hydraulic gradiene = difference in head between 2 points/ length . But , i am not sure why A ( area) is given by $$l_1$$ , $$l_2$$ and $$l_3$$ only ? Homework EquationsThe Attempt at a Solution I...

Air is flowing through a pipe, through a heater matrix. Flow, Inlet temperature and heater power vary. Is it possible to calculate the heat capacity of the matrix by using the Inlet & outlet temperatures, power & flow? I'm assuming no heat loss to the pipe walls to make it easier, but I'm not...

Homework Statement It's stated in the notes that line fg is the flow line . Why is it so ? Homework EquationsThe Attempt at a Solution I think it's wrong . The flow line is defined as a line along which the water paticle travel from upstream to downstream in the permeable medium . However ...

NOTE FROM MENTOR: The posts in this thread have been split out from a previous thread on a different subject. The current subject is flow in porous media. Thank you, Dr Chet. By the way, Have you ever touch the field of liquid flow or multiphase flow in the packed bed? I have some new...

Pardon me if this has been asked before, but I'm confused with the implication that SR makes, that there is no objective moment of present. Do the science still believe that the time flows (i don't mean the arrow of time, but the phenomena of flowing/passing, eq. flowing of a river)? I mean, how...

Hi there, I attached an image of a basic linear motor. I'm a little confused if I use the right hand rule or left hand rule. I did it both ways and I think the left hand rule is the only rule that allows for a force being applied to the right. I assume the current is going down rather than...

I am an engineer who needs to help my chemical transport girl friend with a little basic physics. It has been about 35 years since basic physics for me so I am rusty. She wants to understand how to calculate the following: She drives a large tanker (cylindrical) which carries a variety of...

A 8000 gallon truck of ethanol begins to flow into a tank containing 80,000 gallons of ethanol, how is this possible?

Hi guys, is the current flow in this picture correct? I'm trying to understand current flow in a two source circuit.

Say you have a rectangular channel with a width, w (m), and a height, h (m) and an infinite length. The channel itself is fixed and none of the sides can move with respect to one another. If you know the volume flow rate, V (m3/s) of fluid through the channel, how do you calculate the shear rate...

Homework Statement : See below paragraphs[/B] Homework Equations : I'm not sure on which equations I need.[/B] The Attempt at a Solution : I'm so sorry, this really isn't my strong point. Using the figures below, the tank surface is 113.184 sq in. The side pipe has a cross section area of 3.14...

So, i just started an elementar study on hidrodynamics and I'm stuck with something. We have that the circulation in a closed path Γ is given by: ##C_Γ=\oint_Γ \vec v⋅\vec {dl}## And that, in a irrotational flow, ##C_Γ = 0## for any given Γ. But if we have an irrotational vortex wouldn't...

Hi,how is the movement of the electrons in photovoltaic? I understand that there is n and p layer. What I do not understand is why the electrons does not move more directly to the p-side from the n-side. In the currect explanation it requires a circuitry. Thanx.

I have a work related question. Although it seems like a relatively simple question, I am having difficulties finding the correct equation(s) to calculate the answer. Question: Given a fixed volume air tank filled with pressurized air, how does one calculate the flow rate over time through...

Hey people, I have a pressure vessel pressurized to say 20MPa at 33C, of which I'm working with a gas (scCO2 to be exact) which will then be released into the atmosphere (standard pressure and temperature) through a release valve; I'm wondering how long it will take for the pressure to reach...

I'm trying to learn more about how air compressors work (not how they mechanically function - how they're input/out pressures and flow rates work) and I'm having a lot of trouble getting a specific questioned answered even after a lot of google searching. Suppose I have a compressor that the...

I am aware of laminar flow but would like to look for some other ways. Is it possible to block ions from flowing in the "wrong" direction by applying a magnetic field to the electrolyte and let neutral molecules pass through?

There are some plastics I am using that when melted, pull apart in a stringy way. My best comparison is like melted cheese in a sandwich. I want to know more about this, but other than looking up 'polymer rheology', I'm not sure what I should call this type of flow. I want to know what causes...

Hi all. Rather than a physics student, I'm a translator, and tucked into a piece I'm translating from Japanese is an obscure (to me) physics reference. The sentence goes something like, "It seems a type of convection is taking place amid the serpentine flow of my memory." If someone could...

Bernoulli's equation gives us this as the flow rate from a pressurized tank: $$v = C_v \sqrt{2gh + \frac{p}{\rho}}$$ where ##C_v## is the velocity coefficient, ##g## is the acceleration due to gravity, ##h## is the height of the water above the exit hole, ##p## is the excess pressure above...

Temperature with hot spot by Ir thermal cameras of modern development is being used for measuring on the object of terminal surfaces and cable working temperatures in particular working loads. However, so far no measurements has been designed to obtain the result on the flow of current...

I have a diesel pump doing 900 lpm with a hose reel 30 meters long, the inside diameter of the hose is 32mm. The frictional loss for 30 meters of hose is 461.04 kPa. The Viscosity of Diesel is 4.5 mPas. I would like to know the final flow rate. thanks in advance

I have question, why can condesator get charged, when connected to voltage source, if for current to flow, there most be closed wire, but here it is not, but there still is current? Thanx for answers.

Hi, Quick description of the problem at hand: spherical perfect conductor around the origin with radius a, spherical shell (with radius b) around it made of a material with given magnetic permeability bigger than 1. Uniform Magnetic field in the area. The solution I am looking at (which I won't...

Hi, I have a question about air flow. My room is located on the corner-end of my building, on the 7th floor. I have two windows, each one facing a different side of the building, and one of the windows typically produces the breeze, and the other never does. When the door to my room is closed...

Homework Statement What is the net heat flow of an aluminum disk (emissivity = 0.05) with radius 10 cm and temperature 293K placed inside a room where the temperature is 300K? Asurface = π*r2 = 0.01π m2 Homework Equations Hnet = A*e*σ(Tradiate4-Tabsorb4) The Attempt at a Solution By simply...

Hey guys. I could use some explanation since I am new to FM: So my problem is the following one: Fluid flows with an average velocity 8 m/s in a pipe with diameter 3m. What is the volume flow rate? Now, I think the formula I got to use is Q= v.A Yet, I found my solution from a formula I found on...

Homework Statement More a report question but unsure where to put it. Take a 5mL syringe and a 10mL syringe (both filled to 5mL) with the plungers removed. Time how long it take to full drain each syringe Make a statement regarding your results. Homework Equations Fluid flow rate = volume /...

Homework Statement Homework Equations Manson method The Attempt at a Solution I used Manson method. I am not sure this is the best result. can someone use MATLAB or some software to solve this quickly ??

Hi, As per my observation and experience, when we use evaporative cooler to cool the inlet air to the gas turbine, the compressor discharge pressure (i.e PCD or P3) rises. As, the temp. of the inlet air drops and the mass flow increases due to the increase in density, I believe the discharge...

Suppose I am considering the diffusion of heat in three dimensions: \frac{\partial T}{\partial t}=\frac{1}{r^{2}}\frac{\partial}{\partial r}\left(r^{2}\frac{\partial T}{\partial r}\right)+\frac{1}{r^{2}\sin\theta}\frac{\partial}{\partial\theta}\left(\sin\theta\frac{\partial...

I am looking at evaporating droplets and I am interested in looking at when there is azimuthal symmetry, and I need to write the Navier-Stokes equations for this. I just set all \varphi terms in the spherical case equal to zero right?

I'm doing a little project of mine and am currently trying to figure out if my machine(being built) would work how i want it to work. So i have a tube that goes in a full circle, this tube has 2 hand cranked turbines that give the water its initial motion to go round and round. Theres little...

Homework Statement Consider an aircraft turbine as in the figure below. In the reference frame of the turbine, air of density ##\rho_0## comes into the turbine with speed ##U_0## through the entrance with cross sectional area ##S_0##. In the combustion zone, air is mixed with the fuel and...

I'd like to use 2-d for simplification. Divergence is the rate of change of a component of a field F as you travel along that component's direction. So Fx represents the part of F flowing the X direction and same with Fy along the Y direction, and so divergence is calculated by dFx/dx +...

There's been a discussion going on since this following thread: Range of frequency of electromagnetic wave how electric current flow through a conductor. I need a proper clarity, does the electrons literally displace and flow or just the disturbance/energy travel through conductor making...

Hello, I want to find the mass flow rate of flue gas, i have only the diameter of pipe and ID fan speed which are 1.48Meter and 980 RPM respectively

Homework Statement q = -kdp/dx Homework Equations q = heat flow k = constant p = thermal energy density The Attempt at a Solution This equation says that when heat flows from hot to cold the thermal energy density increases but why? I thought heat meant a higher thermal energy density and hot...

Hello, I'm having a question regarding the sensors and the techniques in fluid mechanics. Since my skills are amazing in this field, here I'm asking you questions xD I want to measure the air pressure of this tube/pipe (P1,P2,P3). This pipe will be flushed with water and then with compressed...

I have learned that diffusion/heat equation can be used to model groundwater flow in confined conditions. Recently I read a paper where they used linear Boussinesq equation (equation 1 in linked paper) to model groundwater flow in unconfined aquifer. Then in another paper, the auther said, he is...

Homework Statement The Attempt at a Solution Top left: No charge flowing through circuit b/c switch is open, not closed. Top right: No charge flowing through circuit b/c circuit does not connect positive and negative terminals Bottom left: Charge flows through circuit b/c closed loop between...

Homework Statement Question attached: Homework Equations see below The Attempt at a Solution - The theorem without prove i require needed is that the cut of maximum flow is given by the cut of minimal capacity. My proof would be along the lines of: - using this theorem, obviously 100 is a...