Plate Definition and 1000 Threads

Hi I am woking on a project with dimensioning a plate heat exchanger and are looking at the effectiveness NTU method. The textbooks provide NTU equations for many kinds of heat exchangers but not for plate heat exchangers. Does anyone knows where I can find an NTU equation for a counter flow...

Homework Statement This is my problem in all its glory. Homework Equations f = uN The Attempt at a Solution For part a I simply did that tan(alpha) = f/N and therefore alpha = arctan(f/N). This simplifies to alpha = arctan(u). I believe this part is correct. The second part of this question...

Homework Statement I have 750+CD +200=200-Fay -Fby = 0 then can someone suggset at which point or axis i should calculate the moment ? seems like no point / axis is suitable to do that ... Homework EquationsThe Attempt at a Solution

1. Homework Statement A large parallel plate capacitor with uniform surface charge σ on upper plate and −σ on lower is moving with a constant speed v. Q1]Find the magnetic field between the plates and also above and below them. Homework EquationsThe Attempt at a Solution I know that above...

Hello, I am stuck on this one problem. The problem asks: How many different 7-place license plates are possible when 3 of the entries are letters and 4 are digits? Assume that repetition of letters and numbers is allowed and that there is no restriction on where the letters or numbers can be...

Homework Statement Consider a parallel plate capacitor of area A and separation d. The plates are isloated. One has charge +Q and the other -Q. An isolated conducting plate of area A and thickness t is inserted between the plates as shown. a. Find the E fields between the conductors b. Find...

nvm

Homework Statement My lecture notes say that no current flows through capacitors as the dielectric material is a poor conductor. It goes on to say that the capacitor appears as an open circuit to a DC voltage source. It then says that charge will accumulate on the plates with an equal amount of...

Homework Statement What's the difference in using GPS Data vs. using Magnetic anomalies, fracture zones, hot spots to analyze plate motion? Homework EquationsThe Attempt at a Solution Seems like a question with a direct answer. What's the difference between the two? I am struggling to find...

Homework Statement As water flows through the pipe at a velocity of 5 m/s, it encounters the orifice plate, which has a hole in its center. The pressure at A is 255 kPa , and at B it is 180 kPa, Assume water is ideal fluid, that is, incompressible and frictionless. Determine the force the water...

If, by some means, the distance between the parallel plates of the capacitor is reduced to half of what it was before, would the time constant change? If yes, then what would be the new time constant?

Hello Peeps~ I have couple of questions related to vibration and I would really appreciate some help from you experts out there. Anyways, say I have a metal plate with mode shapes observed at 100 Hz and 300 Hz as shown in the below figures. If I were to chip(cut) off a small part of the...

Homework Statement When a dielectric is partially inserted between two plates of a capacitor that is disconnected, what will be it's motion? Also what will be its motion if the capacitor is connected to a battery? Homework EquationsThe Attempt at a Solution For the first part. I think the...

Homework Statement 1. I would like you to find and describe an area of the world for each of the types of plate boundary combinations introduced in class today (you should have 4 total locations): (1) Ridge-Fault (2) Fault-Trench (fault on concave side of trench) (3) Fault-Trench (fault on...

Homework Statement If Mariano throws a 92mph cut-fastball to David Ortiz and strikes him out, how long does it take for the pitch to get to home plate? Compare this to a 81 mph changeup and a 67mph knuckle ball. Homework Equations d= v1*t+1/2(a)(t^2) 3. The Attempt at a Solution...

"DXDP=H/2" Whatchya think? Too inaccurate? Unfortunately the NC dmv doesn't allow for sigma, subscripts, inequalities, or crossed-through H's. =(

hi me again sorry for bad english but I am loooking for a pzt plate as shown in https://institutes.lanl.gov/ei/pdf_files/JIMSS2005.pdf i seen sights like americanpiezo but i can't find the same 50 hz resonance one can someone help me find one? is their a better one than the one in the article...

Homework Statement A plate is fixed to the ceiling by two wires and to the wall by a single wire. The wall wire is cut. Calculate the tension in the two remaining wires. mass = 800 kg g = 10m/s² Dimensions in sketch Homework EquationsThe Attempt at a Solution Equations: Ra*cos30 + Rb*cos30 =...

Homework Statement A dielectric-filled parallel-plate capacitor has plate area A = 15.0 cm2 , plate separation d = 9.00 mm and dielectric constant k = 4.00. The capacitor is connected to a battery that creates a constant voltage V = 15.0 V . Throughout the problem, use ϵ0 = 8.85×10^−12 C2/N⋅m2...

Hello, I would like to build a Vacuum chamber for -29Hg(-1bar). The Chamber that I'll be using will be 0.157 icnhes(4mm) cooking pot. Diameter around 10'' and 9'' tall. I also want to heat up to chamber between 100-160F(40-70 Celcius). The chamber will be used for degassing Buthane out of a...

Homework Statement Show that the moment of inertia of a rectangular plate round it's diagonal, line B-B is equal to the one round a line parallel to one of the edges and passing through the center, line C-C Homework Equations Moment of inertia: ##I=mr^2## The Attempt at a Solution For the...

Looking for research on the destruction of biological evidence due to the subduction and destruction inherent to plate tectonic activity. One, are there any places on Earth that have not been affected by tectonic activity? And two, what is our chronological limitation in looking back at...

So i have this simple situation where i have an electron beam with a certain kinetic energy, and i have a metal plate connected to the ground, and the electrons hit the plate, now i want to know the voltage of the current in the wire to the ground. Now i know both kinetic energy of the electrons...

Homework Statement Plate capacitor with distance between plates 'd=4mm' is fully filled with homogeneous linear dielectric. Capacitor is connected to the source of DC voltage, first stationary state is established, then the capacitor is separated from DC voltage source. After that, dielectric...

Hi all Random question: yesterday an empty ceramic / porcelain dinner plate was accidentally dropped on a tiled floor from the dinner table. Amazingly, it did not break. It was picked up and set aside on the kitchen counter, where it remained untouched. After about 15 minutes, there was a loud...

Do parallel light rays diverge if ever so slightly upon exiting a spiral wave plate? See image below. Images from...

So, this is kind of a fun post, but I have a Vespa and I am about to register it in a new state. I thought about being clever and having the first few digits of e being my license plate number. Any ideas?? Thanks, Jonathan

Homework Statement Please see attached. Homework EquationsThe Attempt at a Solution I get a result of ## \alpha =\frac{1}{2} ## for part a) - which I think is correct. I'm stuck however on part b) - with the dielectrics. I have that the field in the region where the dielectric is ##E_{1}##...

I am trying to reduce the noise created from a machine that makes contact (impact) with a thin plate. I just don't have anyone to bounce ideas off of. I can change the support geometry to whatever I want as long as it will with stand a static load and the impact. I can handle this, but the...

Homework Statement The inner surface of one of the plates flat charged capacitor has a small hemispherical knoll. Away from it the electric field in the capacitor is equal to ## E_0 ##. Using the principle of superposition find the field at the top and at the base of the knoll. Homework...

Hi everyone. I have a problem with my device. It consists of a parallel plate capacitor with plates made of galvanized iron. Each plate's area is 1mx1inch. It's connected to a bleeder resistor and basically, the circuit is just a simple RC circuit. The source I'm using is a constant 5V DC...

I'm moving on to a new area of focus at work and have found myself analysing a vibration issue. I've had the basics a BSME gets you at an accredited university (20 yrs ago), but am rusty to say the least. I'm looking for guidance on good reading materials to knock the rust off. My problem is...

I am trying to apply a force to the tube structure via the plate. I am struggling to get this to solve. Current set up is as follows: Frictionless contact between the two compenents displacement constraing the plate in the x direction force applied to the plate Could anyone offer some...

The plate (glass) is 1400 x 700 MM at right angles to the wind. The wind velocity is 42 Metres per second. The height above the ground is 6 metres. Your help to an 85yo would be enormously appreciated. Ian Richards.

i have done the capacitance of an isolated charged sphere (=4 pi E R).but can we find capacitance of an isolated ,infinite charged plate too??how?

I am trying to understand the no slip condition (parallel velocity =0) in the presence of a permeable surface (in this case a Reverse Osmosis filter mesh ). Does the presence of permeability affect the no slip condition ? Intuitively For a gas Where viscous effects are dominated by momentum...

Hi, I tried to find design regulations/codes that specify relations between bolt diameter/bolt length against connected plate thicknesses. I couldn't find that in Eurocodes 3. Can someone help me with info where to find those regulations ? Example: can we connect 5 mm plates using M24 ? or...

Homework Statement Note - I have used an image here. For the simple reason I don't want to confuse anyone by missing out subscripts. But if that is not acceptable let me know and I will attempt to write it out. Homework Equations I have considered using Poissons equation - but couldn't...

A square plate has a side of 100mm. It is connected to the cathode in a copper electroplating bath and a current of 4A is passed through the bath. Neglecting the thickness of the plate, determine how long it takes to cover both sides of the plate with copper to thickness of 0.1mm Density of...

Homework Statement The temperature distribution of a circ plate with radius ##a##, ##f(r,\theta,t)##, follows the diffusion equation ##\nabla^2f=\frac{1}{\alpha^2}\frac{\partial f}{\partial t}##, with a temperature of zero along the border. The initial temperature is...

Homework Statement In plane parallel plate the refractive index is a function of coordinate ##z##, so that ##n=n_0 -{n}'z^2## for ##{n}'>0##. The origin of the coordinate system is in the middle of the layer, and ##z## is parallel to the normal of the layer. In paraxial approximation calculate...

I just did a thermoelectric generator from seebeck plate. And when temperature increases, the plate's resistance increases from 12 ohms to 8 M ohms. Why is that and how todeal with it??

Hi. I need help calculated the tension on bolts in an anchor plate. The plate is bolted to a concrete wall with four bolts (see the included image). A bending moment acts on the plate, offset a bit up/down. The bending moment acts from up to down so that the upper two bolts are in tension and...

Homework Statement Consider a parallel-plate capacitor, with two square plates of side \mathrm{12.0 cm} separated by a \mathrm{4.50- mm} gap. Half of the space between the gaps is filled with a material of dielectric constant \mathrm{K = 3.40}, while the rest is filled with just air. (a) What...

In an example in my book, the author poses the following question: Given two large plates at a distance d from each other with arbitrary charges Q' and Q" (with Q' on the bottom plate and Q" on the top plate), how are the charges distributed on the plates? The author lists the following...

When modelling the heat transfer through a plate using fouriers equation, what difference would it make if the width and length of the plate were set to a specified value rather than being infinite?

Hello! I'm hoping someone can help me with my problem. I'm currently working on a low cost parallel plate capacitor. I used a galvanized iron as the plate material since this is a low cost material. The problem is when I measure the voltage across the capacitor, the voltage read peaks at a...

we are building a hydrotesting chamber, the steel plate will be a sheild wall. if something goes wrong in pressure testing the steel plate should withstand the pressure without deforming, i am stuck in how to calculate the thickness applicable to withstand it. hydrotesting pressure is 25,000 psi...

I am designing a flat plate heat exchanger for a project and I am not sure where to start with the hand calculations, specifically the LMTD and E-NTU methods, also how to work out the parameters which i will need to complete these methods such as area and number of plates. My deadline is soon...

<<Moderator note: Missing template due to move from technical forum.>> I am having difficultly with a problem in my fluid mechanics course and I'm hoping someone could help me out. Here is a screenshot of the question I'm stuck on: So far I have been using Bernoulli equation to find the...