Adjay S.

Pursuing B.E in Chemical Engineering

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Physics (Fluid Mechanics)

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Question:

Does the Reynolds number criteria of 2300 tell if the flow regime is turbulent or not?

Adjay S.

Answer:

No, Turbulence can be achieved at much lesser reynolds number. For micro-fluidic systems literature proof exists confirming that turbulence can be achieved at reynolds number as low as 200-300

MATLAB

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Question:

Write a code to find the center, radius and some statistical data of hand drawn circles using MATLAB

Adjay S.

Answer:

clear all; close all; %Please make sure to move to the Image Directory before Run% %Change Figure name inside quotes% A=imread('circle.bmp'); [m,n]=size(A); %To find the dimensions of the image% imagesc(A),colormap(gray) hold on %In our case the row denotes the y coordinate and column the x coordinate% %Finding the center of the circle% count=0;sumx=0;sumy=0; for i=1:m for j=1:n if A(i,j)==0 sumx=sumx+j; sumy=sumy+i; count=count+1; end end end cenx=sumx/count; ceny=sumy/count; plot(cenx,ceny,'r*'); radius=0; %Finding the AVERAGE Radius% for i=1:m for j=1:n if A(i,j)==0 radius=radius+sqrt((i-ceny)^2+(j-cenx)^2); end end end radius=radius/count; th = 0:pi/50:2*pi; xunit = radius * cos(th) + cenx; yunit = radius * sin(th) + ceny; plot(xunit,yunit); %Variance Calculation% dev=0; for i=1:m for j=1:n if A(i,j)==0 dev=dev+(sqrt((i-ceny)^2+(j-cenx)^2)-radius)^2; end end end SD=sqrt(dev/(count-1)); STDERROR=SD/sqrt(count); fprintf('Center = %d, %d',cenx,ceny); fprintf('\nAverageRadius = %d',radius); fprintf('\nRad_StdDev = %d',SD); fprintf('\nCOV = %d',STDERROR);

Chemical Engineering

TutorMe

Question:

Where would you put a corrosive fluid in a double pipe heat exchanger and why? What are the different types of pitches used?

Adjay S.

Answer:

The corrosive fluid is placed in the tube side as it would then corrode only the tube side, which can later be replaced compared to higher costs when putting it in the outer pipe. The different types of packings are majorly: 1) Triangular 2) Square

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