I don't know. My channel is growing, but ever so slowly. Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are hundreds of free videos about the Bible, fluid mechanics, science, math, statistics, air pollution, and other topics. I would greatly appreciate it.
In the iterrations example (2nd example), why is the minor loss coefficient of the oulet 1.05? How did you assume that the flow is turbulent without knowing Reynolds number initially?
Ahhh... good question. You don't know beforehand. So, you must choose laminar or turbulent and then go through the analysis. At the end, calculate Re and see if your assumption was correct or not. I did exactly that in Lessons 08D and 08E with a different example. I assumed laminar but found out that it was turbulent. Then I repeated the problem as turbulent. Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are over 500 free videos about the Bible, fluid mechanics, science, math, Excel, statistics, air pollution, and other topics. I would greatly appreciate it.
@johncimbala, Professor, I wonder if you are willing to make a quick video demonstrating how to program the iteration method used in this video in MATLAB? I assume there is a while loop, but I am struggling to get the code right: clear clc g = 9.807; H = 35; L = 20; D = 0.025; rho = 998; epsilon = 0.00010; mu = 0.001002; Ksum = 13.35; f = 0.04; % Guess f n = 1; while f(n+1)-f(n) > 0.00000001 V = sqrt(2*g*H/(f*L/D+Ksum)); % Calculate V in m/s Re = rho*V*D/mu; % Calculate Reynolds number % Solve Churchill equation for new f A = (-2.457*log((7/Re)^0.9+0.27*epsilon/D))^16; B = (37530/Re)^16; f = 8*((8/Re)^12+(A+B)^-1.5)^(1/12); end f = sprintf('%0.4g',f)
I am not that great with MATLAB. Perhaps someone else can give you some hints on your code. Some of my students use the Solve function in MATLAB effectively. I usually use Excel for this kind of problem. Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are over 500 free videos about the Bible, fluid mechanics, science, math, Excel, statistics, air pollution, and other topics. I would greatly appreciate it.
Thank you for your comment and your "eagle eye" spotting that mistake. Please tell your friends and colleagues about my RUclips channel where there are hundreds of free videos about the Bible, fluid mechanics, science, math, statistics, air pollution, and other topics. I would greatly appreciate it.
how is this not all over the internet for FM, thank you!
I don't know. My channel is growing, but ever so slowly. Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are hundreds of free videos about the Bible, fluid mechanics, science, math, statistics, air pollution, and other topics. I would greatly appreciate it.
In the iterrations example (2nd example), why is the minor loss coefficient of the oulet 1.05? How did you assume that the flow is turbulent without knowing Reynolds number initially?
Ahhh... good question. You don't know beforehand. So, you must choose laminar or turbulent and then go through the analysis. At the end, calculate Re and see if your assumption was correct or not. I did exactly that in Lessons 08D and 08E with a different example. I assumed laminar but found out that it was turbulent. Then I repeated the problem as turbulent.
Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are over 500 free videos about the Bible, fluid mechanics, science, math, Excel, statistics, air pollution, and other topics. I would greatly appreciate it.
@johncimbala, Professor, I wonder if you are willing to make a quick video demonstrating how to program the iteration method used in this video in MATLAB? I assume there is a while loop, but I am struggling to get the code right:
clear
clc
g = 9.807; H = 35; L = 20; D = 0.025;
rho = 998; epsilon = 0.00010; mu = 0.001002; Ksum = 13.35;
f = 0.04; % Guess f
n = 1;
while f(n+1)-f(n) > 0.00000001
V = sqrt(2*g*H/(f*L/D+Ksum)); % Calculate V in m/s
Re = rho*V*D/mu; % Calculate Reynolds number
% Solve Churchill equation for new f
A = (-2.457*log((7/Re)^0.9+0.27*epsilon/D))^16; B = (37530/Re)^16;
f = 8*((8/Re)^12+(A+B)^-1.5)^(1/12);
end
f = sprintf('%0.4g',f)
I am not that great with MATLAB. Perhaps someone else can give you some hints on your code. Some of my students use the Solve function in MATLAB effectively. I usually use Excel for this kind of problem.
Thank you for your comment. Please tell your friends and colleagues about my RUclips channel where there are over 500 free videos about the Bible, fluid mechanics, science, math, Excel, statistics, air pollution, and other topics. I would greatly appreciate it.
darcy friction factor has a minor mistake in position of the numbers. should be .03118?
I noticed you fixed it later in the video.... disregard haha
Thank you for your comment and your "eagle eye" spotting that mistake. Please tell your friends and colleagues about my RUclips channel where there are hundreds of free videos about the Bible, fluid mechanics, science, math, statistics, air pollution, and other topics. I would greatly appreciate it.