# What is Flux calculation: Definition and 26 Discussions

The neutron flux, φ, is a scalar quantity used in nuclear physics and nuclear reactor physics. It is the total length travelled by all free neutrons per unit time and volume. Equivalently, it can be defined as the number of neutrons travelling through a small sphere of radius

R

{\displaystyle R}
in a time interval, divided by

π

R

2

{\displaystyle \pi R^{2}}
(the cross section of the sphere) and by the time interval. The usual unit is cm−2s−1 (neutrons per centimeter squared per second).
The neutron fluence is defined as the neutron flux integrated over a certain time period, so its usual unit is cm−2 (neutrons per centimeter squared).

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1. ### Meaning of "Average" Flux Tallies in MCNP

Hello, I've been working with MCNP on and off for a few years now, but just recently realized that I don't entirely understand how tallies are actually calculated in MCNP, and what they signify. Taking the example of the F2 tally, the user manual (Section 3.3.5.1) states that F2 is the "flux...
2. ### Flyback Converter Magnetic Flux Calculation

Hi I am designing a flyback converter. The calculation (.jpg file) is based on Daniel W. Hart Power Electronics book. The transformer model consists only of an ideal transformer and its magnetizing inductance (or "primary inductance" in some textbooks). The datasheet of the transformer's core...
3. ### Photon Arrival Rate, Chapter 1.5 from Computer Graphics by Folly

I've been reading Computer Graphics: Principles and Practice by Folly and I've encountered the following paragraph in chapter 1.5. I haven't understood how he got to the result in the following calculation, that if there exists a single 100W light bulb, emitting an order of ## 10^{12} ##...
4. ### Toroidal Inductor Flux Calculation

Summary:: A 4.3 mH toroidal inductor has 100 identical equally spaced coils. If it carries an 11.6 A current, how much magnetic flux passes through each of its coils? Express your answers in milliwebers. 4.3 mH= (Wb/A) 100= N 11.6= I Φcoil= ? So from my observation of another question...
5. ### Flux of a non-uniform E field through the face of a cube

Phi = int of (3xi^ + 4j^).vector dA = 3 int of(xdA) Now we put x= 3 and we get at last 36 N m^2/C. I am getting confused why E is a fuction of x. How can that be? How can we represent the E and position x on the same coordinate system. Is it right ? Because we know distance is inversely...
6. ### Engineering How to calculate rotor flux of the three phase squirrel cage induction motor?

Three phase squirrel cage induction motor with given parameters (stator winding connected in delta) nominal power: Pn=22.4kW nominal stator voltage: Vsn=230V nominal stator current: Isn=39.5A nominal stator frequency: fsn=60Hz nominal speed: nn=1168min−1 number of pole pairs: 3 stator...
7. ### Electrodynamics flux calculation question

I don't really know how to find it mathematically as I am really confused in finding the normal vector and finding the electric field as well. pls help
8. ### Calculating flux with a magnet and a coil

Homework Statement [/B] Hey, I'm having some difficulties with my physics project and I hoped someone could help me out. We have to calculate the magnetic field, but first we need to know the flux. This is the setup we got: We have to let a magnet fall through a PVC tube. The tube has a coil...
9. ### Calculating the flux from a flashlight

Can you use the flux-luminosity relation, f=L/4*pi*d^2 to calculate the flux of a flashlight at a distance d? As I understand, we can use the relationship given above for a star since we assume that it emits radiation uniformly in all directions, we take the total energy emitted and then divide...
10. ### Heat Flux Calculation for Titanium & Aluminum

Hello sir, How to calculate the heat flux of titanium and aluminum?What are the essentials for doing the calculation?We are undertaking a project of multilayer coated cutting tool inserts..So we are in the need of this. Regards, Shankaralingam.
11. D

### A Determine the flux of the vector field trough the surface

From my drawings it seems to be half of hemisphere. Am I right? How can I solve this task? Determine the flux of the vector field $$f=(x,(z+y)e^x,-xz^2)^T$$ through the surface $Q(u,w)$, which is defined in the follwoing way: 1) the two boundaries are given by \delta...
12. ### I Particle calculation during a solar proton event

Trying to figure out how many particles would bombard an astronaut during a solar proton event. Given that the most possible is around 43,000 particle flux units (pfu) according to NASA. First calculating steradians, assuming a person is 1m^2, 1/(1E9)^2=1E-18. My calculation yields (43000...
13. ### X-ray tube flux and my experimental test setup

Hi everyone! I'm starting to work with a mini X-ray tube provided by Amptek. I want to use it to calculate the efficiency of a detector I'm going to use latter, so knowing the total flux the tube emmits and measuring the flux the detector receives, that should be enough (both data normalized to...
14. ### How Is the Flux of Poynting's Vector Calculated Through a Surface?

I have some problems in calculating the flux of Poynting's vector through a surface. I have that: S=c/4π⋅H^2⋅n (S: Poynting's vector, n: versor of the direction of the propagation of the em wave) H=1/cR A' but: A=(1/cR) d'; A'=(1/cR) d'' ==> H= (1/cR)^2 d''...
15. ### Backing-out luminosity togo from lumens to radiant flux in W

Hi. Has anyone already done the work to back out the standard luminosity function so I can go from lumens at a particular wavelength to radiant flux in Watts? I have visible LED spec sheets with optical characteristics in lumens and I want to calculate the outputs in W. My NIR LED has specs in...
16. ### Electric flux calculation in case of a cylinder

Homework Statement an electric field is uniform,and in the positive x direction for positive x,and uniform with the same magnitude but in the negative x direction for negative x.it is given that vector E=200 I^ (N/C) for x>0 and vector E= -200 (N/C) for x<0 .A right circular cylinder of length...
17. ### Why is the flux through the top of a cylinder zero?

This is example 27.2 in my textbook. I have the answer, but it doesn't make sense to me. I understand that if electric field is tangent to the surface at all points than flux is zero. Why, though, does my textbook assume that the ends of the cylinder don't have field lines extending upwards and...
18. ### Model of how temperature depends on latitude?

Homework Statement I was asked to 'Use a very simple model to find how the Earth’s temperature should vary with latitude.' Homework EquationsThe Attempt at a Solution I was thinking about flux and how this should be proportional to the temperature. So I first thought about the area that is...
19. ### Magnetic flux density calculation for high permeability material

Hi to all of you, As the Biot-Savart-Law is based on experimentations in air, i like to know how to calculate the magnetic flux density in material with much greater permeability, where the circular like shape of the field distribution troughout the vicinity does not apply. Does anyone has a...
20. ### Flux calculation using Gauss’s Theorem

Qn: A uniform electric field of strength 300 N/C at an angle of 30º with respect to the x-axis goes through a cube of sides 5 cm. (a) Calculate the flux through each cube face: Front, Back, Left, Right, Top, and Bottom. (b) Calculate the net flux through the entire surface. (c) An electron...
21. ### Calculating Electric Flux Through a Non-Uniform Hemispherical Surface

Homework Statement A point charge is placed at the origin. Calculate the electric flux through the open hemispherical surface :(x-a)2 +y2 + z2 = a2 x> or = a. Homework Equations The Attempt at a Solution There is no diagram but this is how i visualised the question(please refer...
22. ### Heat transfer and flux calculation

In July the Hanze University and the Rijks University Groningen participate in the Frisian Solar Challenge . This is world race for solar boats. The solar cells we use are so-called B50 cells with an efficiency of 21%. The cells perform worse if the temperature rises. The way we cool the...
23. ### Neutron flux calculation using FFT in a nuclear reactor

well, that's the heading of a project i am doing...i need some help on neutron detectors... how they are dectected and what is the probable graph of count rate vs, pulse height that i might get for a nuclar fission reaction of U-235... can anyone help?
24. ### Calculating Magnetic Flux from Induced Voltage in Proximity Coils

Hi All, I have setup a small experiment with a pulsing coil--Coil 1 to produce a pulsed magnetic flux, say we do not know the specifications of this coil like number of turns on the windings, voltage to the coil, flux density etc. There is another coil --Coil 2 of known specifications...
25. ### Flux Calculation for Sphere of Radius R and Detector Acceptance D

Hi everyone, I have a simple problem for you. If we have an isotropic particle density n(r,E) where r is the radius and E the energy in a sphere of radius R, What would be the particle flux over a single side of a detector of area A inside the sphere? What would it be also if the detector's...
26. ### Troubleshooting Electric Flux Calculation on a Square Surface

I used the formula (E * Area * cos(theta)) and got the wrong answer (.02529) and I really don't understand why. I need help The square surface shown measures 4.0 mm on each side. It is immersed in a uniform electric field with magnitude E = 1930 N/C. The field lines make an angle of 35° with...