What is Loss coefficient: Definition and 11 Discussions
In telecommunications, return loss is a measure in relative terms of the power of the signal reflected by a discontinuity in a transmission line or optical fiber. This discontinuity can be caused by a mismatch between the termination or load connected to the line and the characteristic impedance of the line. It is usually expressed as a ratio in decibels (dB);
where RL(dB) is the return loss in dB, Pi is the incident power and Pr is the reflected power.Return loss is related to both standing wave ratio (SWR) and reflection coefficient (Γ). Increasing return loss corresponds to lower SWR. Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high. A high return loss is desirable and results in a lower insertion loss.
From a certain perspective 'Return Loss' is a misnomer. The usual function of a transmission line is to convey power from a source to a load with minimal loss. If a transmission line is correctly matched to a load, the reflected power will be zero, no power will be lost due to reflection, and 'Return Loss' will be infinite. Conversely if the line is terminated in an open circuit, the reflected power will be equal to the incident power; all of the incident power will be lost in the sense that none of it will be transferred to a load, and RL will be unity. Thus the numerical values of RL tend in the opposite sense to that expected of a 'loss'.
Hi,
I started to think about the drag coefficient of a sphere. At high Reynolds number Cd drops of suddenly when the boundary layer separates. If the Reynolds number is increased further, Cd increases with increasing Re. (I'm thinking about what is referred to as "post critical separated flow")...
i have a y - junction fitting (two inlets (1,2) and one outlet (3)). Two different fluids (with different densities and viscosities but same temperatures) let's say paint and other fluid comes from two inlets, mix and they will go through the outlet. and also laminar flow conditions. How to...
Hi all,
Quick question:
What do you guys use as your reference for minor head loss coefficients (k).
I'm sure those with more experience have their own database/excels of k values found over the years. I have been personally using a combination of my Hydraulic Engineering Textbook and Google...
What is relationship between discharge coefficient and minor loss coefficient. Am I right with that equations?
hl – minor head loss
k – minor loss coefficient
ρ – air density
A – pipe cross section area
Cd – discharge coefficient
Δp – pressure drop
u – air velocity
m – mass flow
here is...
Hello everyone,
I am trying to design an element that its purpose is providing stiffness and damping. The material that I wish to use is rubber.
My question is, how can we calculate the damping coefficient (c) for the calculation of the term c*dx/dt, when we know the loss factor of the...
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The Attempt at a Solution
Usually we are given a table, but how do we calculate the loss coefficient between 2 different pipes with different diameters? In this case, between the 5 and the 3 cm^2 pipes?
Hi, I would like to experimentally determine the flow loss coefficient (or similar performance measure if another is suggested) over the various positions of a 4 way rotary valve (for instance, fully open, 50% open etc). The final outcome would be a specification on the positional accuracy (or...
I am working on a project at my summer internship rerouting some duct work and want to do some calculations to see how much changing some of the 90 degree angles in the duct will improve flow. I don't have my Fluids text with me and was wondering if anyone knew of any good references online to...
Hi,
I want to calculate the pressure loss coefficent for a diffuser but I can't find the equation. I tried with bernoulli but I don't get it. I've read that the coefficient depends on the length the scale and conical degree of the difuser?
Can you help me?
thank you!