Tube Definition and 886 Threads

How to derive the formula to find the bending stiffness of an isotropic tapered tube which is cantilevered with a point load applied at the free end?

Fellows I am planning to build a Lenard tube. Anode and cathode will be in a glass envelope, and the thin titanium window at one extreme of the ampoule. I doubt about the potential needed at the metallic window. As I will glue it with an epoxi, the window will be electrically floating and I...

Difference between neural tube and dorsal nerve cord?

Hello all, this is my first post here, so please excuse me if there are any mistakes or important information is left omitted. Now, my problem is quite intricate and specific so I will be thankful for any information I can get. Using Excel, I am looking to model the volume flow of air through...

I have made a pitot tube that I am using to measure the velocity of air in a pipe. First, I placed the probe into the pipe such that the hole in the probe was parallel to the flow to obtain static pressure. It did this successfully and I proved this using a piezometer. However, I then turned the...

Homework Statement given mass: 100g(the one hanging) Q1 = -30(mu)C Q2 = 70(mu)C Q3 = 50 (mu)C T=? Length of tube = 2m Length of rope = 1m Homework Equations Ft + Fg + Felect =0 F =k *q1*q3/d2The Attempt at a Solution Those were the equations I have done so far, so the answer is 46N & the...

Homework Statement i have a project regarding to boiler efficiency and how can it varies with excess air and flue gas temperature ( using the indirect method ) i will estimate the boiler efficiency at a different conditions , it's not that i can't do the calculations but doing the same thing...

Dear experts, I´m trying to model in ANSYS Mechanical (v14.5) the linear buckling behavior of a cylinder made of BEAM4 elements under combined loading (axial compression and bending moment) applied at the ends. How should I set up the boundary conditions of a cylinder to keep rigid the ends...

If one were trying to heat Argon gas from ambient (~20oC) through a mild steel tube of some diameter 'd' how long would it need to be? Additional unknown includes flow rate of Ar gas so some general function would be adequate. Unfortunately my thermo-book is limited and does not go into enough...

Hi all, "MECHANICAL FLOWER PROJECT" I'm working on a personal hobby art project (non-academic, non-commercial, non-governmental) where I'm mechanizing petals of a plastic flower. Basically, making petals curl open and close. *Please see picture and video. GOAL: To pull continously without...

Homework Statement when target metal is changed to heavier metal in X-ray tube, the min wavelength will not change. but the wavelength of the characteristics line will become smaller. my textbook gives me the above statement explaining much. can someone please explain it? thanks ! Homework...

Homework Statement A hollow pipe has an inner diameter of 80 mm and an outer diameter of 100 mm. If its end is tightened using a torque wrench using 80 N forces, determine the maximum and minimum shear stress in the material. Where are they located? Note: In the diagram of the picture, the...

Hello PF, thanks for having me here. I am working in chemistry and we are building a atmospheric pressure drift tube ion mobility spectrometer. The drift tube consists of 20 stacked stainless steel electrodes insulated by PTFE spacers connected via a resistor chain (voltage divider) to produce...

When I squeeze tube of toothpaste, I am working with 2 squeeze forces toward tube. Why it moves vertically from horizontally applied force (when I think of paste as a group of particles inside a tube I cannot imagine that) ?

Here is my single triode vacuum tube amplifier circuit I understand there needs to be a bias on the grid otherwise the signal will be rectified -not amplified. Is biasing the grid as simple as running a resistor in-between the grid and the cathode on the power supply like this (in red)...

Homework Statement A Torricellian tube (one end open, one end closed) of 1m length is filled completely with mercury and situated vertically the closed end down. Then the tube is flipped around 180 degrees and there is 760mm of mercury left. If we incline the tube at an angle \phi , what is...

I have an aluminum tube with 1.25" ID and 2.25" OD. I drop a neodymium grade N50 magnet, 1" dia, 2" long into the tube and enjoy watching the magnet drift very slowly down the tube. Lenz's law in demonstration. The paramagnetism of aluminum allows the magnet-in-motion to induce eddy currents...

Homework Statement A thick-walled cylindrical tube of dielectric material has internal radius a/2 and external radius 2a, and its polarization is given in cylindrical coordinates by the expression P = (A/r2) er. Derive expressions for the net charge on the inner and outer surfaces of a...

I'm building a sun cover for my open air atrium. Dimension is 8x8 ft. I'm building with clear cedar(ver expensive). In one direction, I'm placing 19 8ft 2x4 cedar boards tilted vertical and spaced 5 inches apart. Knowing the boards spanning 8 ft, anchored at both ends to the square frame...

Let's say there is two tubes(cylinders with no tops or bottoms) with charges ##q_1## and ##q_2##, radii ##b_1## and ##b_2##, lengths ##l_1## and ##l_2##. These tubes are located along the axis of each other's surfaces like in this figure: I know I have to use Coulomb's law rather than Gauss law...

Homework Statement So, I am having trouble trying to understand my results. The experiment was marble (1.5cm & 5gram) was dropped on the surface of water, in a 40 cm cylindrical tube roughly 4cm diameter. The graph is negative, since the I used a program to analyse the velocity. Homework...

Hello, Looking for some advice on increasing bending stiffness of a mild steel 1" x 0.065" round tube. This is for a motorcycle frame and clearance is an issue. There is a fuel tank above and the engine below this top tube (two running parallel) that I wanted to reinforce against bending...

A uniform long tube is bent into a circle of radius R and it lies in vertical plane. Two liquids of same volume but densities ρ and δ fill half the tube. Show that the angle θ = arctan{(ρ-δ)/(ρ+δ)}

Hi All, I would like to ask if what supplier's fabricate Low Coefficient of Thermal Expansion (CTE) glass tubing for Fiber Optics application. or What type of glass do we need in Low CTE? It will serve as the packaging for DWDM components. Hoping for your response. Thank you.

I am looking to make my own parabolic solar trough but find some terminology used confusing: What do the phrases "single target", "two target", and "three target" mean in the context of evacuated solar tubes? Example links of the phrases in use are provided below! • general search for...

I am looking to get air to the tip of 1mm internal diameter (1.4mm OD) metal SS tube around 5 inches long that is connected to the source by 12 ft of brass tubing which is slightly larger in size than the SS tube. The air pressure needs to be around 500psi to enable flow through the narrow...

Hi everyone, I need to calculate the force required for machining a circular tube of outer dia 32 and a wall thickness of 2.3, how much ll be the force required for the machining the outer dia to 25?

I'm having a bit of difficulty conceptually understanding a problem. Hoping someone here can clear it up for me. In a simple circular condenser tube (which is cooled by water or air) what happens the tube wall temperature as the steam inside is condensed? Intuitively I would have thought that...

How does the orientation affect how much a steel tube can hold? or does it not really have an effect?

Hi there, I have been in contact with a manufacturer as I require both a pitot tube and a differential pressure transmitter for my process. Both will be used in a small scale process (around 10 l/min). I want to ask if it is possible that a flowrate can be too small to generate a large...

A square tube beam, 4in x 4in x .1875in thick. Length= 36in Cross sectional Area= 2.859in^2 A36 steel How do you determine its max load capacity?

Please could someone explain to me what is meant by the radially symmetric "breathing resonance" of a sealed water filled tube or cell? That is with the use of transducers this can be achieved, but what does it mean? is it talking about generating a standing wave in the fluid? It relates...

hello everyone is anybody here using comsol multiphysics? i'm trying to model a tube which the inlet is a fully developed fluid but the problem is how to enter a parabolic inlet profile for velocity in 2d axisymmetric it is very simple. but my model is 3d i've entered "r" as a variable in...

Hello, I was thinking about how would capillary action change in a tube (classic example) and in a tube fitted inside another tube (considering water as the liquid involved). This is no homework question, it's just a thought which striked my mind but I don't have sufficient basic knowledge...

hello, I am trying to find the new moment of inertia total for a rectangular stainless steel 4"x2"x.25"thk with a 3"x.75" flat bar welded on top of the short side of the rectangular tube. The short side (.75") of the flat bar will be welded to the center of the rectangular tube to the 2"...

anode heel effect occurs in a direction parallel to the anode-cathode axis?

Is momentum conserved? I am considering the Euler equations in conservative form and solving the Sod shock tube problem I have written a Godunov finite volume type solver. It solves for density ρ, momentum ρu, and total energy E; therefore, I would expect all of these quantities to be...

Homework Statement The inside of horizontal and ##1m## long tube is divided by 3 moving pistons (no friction) with ##m=1kg## into 4 identical parts - each containing ##10g## of Helium at constant temperature ##T=300K##. Calculate the frequency of oscillation for each piston around the...

Homework Statement Hello everyone, How do I go about this problem; Describe the motion of the particle, m, inside the rotating tube. (See attachment please.) At time t=0, r(t=0)=b and \dot{r}(t=0)=v_{0} Homework Equations I think it would be practical to use polar coordinates to describe...

Hi, I was wondering if there was an equation for the flow rate through a straight vertical or angled capillary tube. All I can find is how to calculate the height it rises but I would like to know how to find the rate it rises. I imagine it is not a steady rate since it must stop once it...

Homework Statement A drip-irrigation emitter constructed of a coiled capillary tube is inserted into the wall of a drip irrigation line with a constant water pressure of 5 psi. Compute the required length of the emitter’s capillary tube to produce an emitter dripping rate of 2 litres per...

Hi, what differences are if i use a pvc tube to build an actuator(solenoid with plunger) or alluminium? Alluminium can intensify magnetic field? but the plunger will stick with alluminium? or solenoid will have less force?

Homework Statement A uniform glass tube is bent into a U shape. Water is poured into the tube till it stands 10cm in each tube. Benzene (sp gr = 0.879) is then slowly added to the tube on the left side until the water rises 4cm on the right. What length is the column of benzene when the...

Hi All! This is my first question/post here, so I will try to make it work! Homework Statement Ok, so the question is simple-ish. Homework Equations Faradays Law (ε=-NΔΘ/ΔT) The Attempt at a Solution Now, I understand the concept that as the magnet is falling towards the coil, the coil...

Homework Statement A horizontal tube of uniform cross sectional area 'A' is bent in the form of U. If the liquid of density 'ρ' enters and leaves the tube with velocity 'v' then how much external force is required to hold the bend stationary ? Homework Equations The Attempt at a Solution I...

Someone on another forum shared with me that a 6L6 vacuum tube exhibits a blue dot when in operation that is supposed to be Cherenkov radiation. I say nay, as I have worked out the relativistic velocity using $$KE={ m }_{ 0 }{ c }^{ 2 }\left[ \frac { 1 }{ \sqrt { 1-\frac { { v }^{ 2 } }{ { c...

Homework Statement A plastic tube has a cross-sectional area of 5.00 cm^2. The tube is shaped sort of like a "U". The left arm is filled with water until the right arm of length 0.800 m is full of water. The right arm is then sealed with a cap that won't pop off until a force of 9.8 N is...

The figure shows a U tube of uniform cross-sectional area A containing liquid of density p. The total length of the liquid column is L. When the liquid is displaced by an amount x from its equilibrium position, it oscillates with simple harmonic motion. The weight of liquid above AB provides...

Magnetic field inside infinitely conductive hollow tube Homework Statement There exists a thin-walled hollow aluminum tube (assume σ=∞) of radius 10 cm centered around the z-axis. A long wire with 5 mm radius has a total current 2 mA in the z-direction and is centered initially at x=-5cm as...

Hi everyone, In a current project, I'm curious about the risk of silicone tube cold welding when used with a solenoid pinch valve, such as = http://cfnewsads.thomasnet.com/images/large/454/454667.jpg What is the likelihood silicone tube will cold weld at the pinch point, if the pressure is...