Reynold's Number Demonstration.doc

8/9/2019 Reynold's Number Demonstration.doc

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Turbulent flow denotes an unsteady condition due to inertial forces where stream lines

interact causing shear plane collapse fluid) /nder this condition the dye will become

dispersed as miing occurs)

2here3

Re 4 Reynolds number

V 4 luid *elocity !m6s&

D4 bser*ation tube diameter !)1m&

v 4 7inematic *iscocity !)8%( 1$ m#6s&

Re < 4000


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PROCEDURE:

1. 9ake sure the stilling tank filled with water until it can stand for sometime)

2. pen the control *al*es of the stilling tank and allow water to flow through the

obser*ation tube)

3. pen the *al*es of the dye in:ector and allow the dye to mo*e through the tube)

4. ;ow, control the speed of water flow until the filament of dye in the obser*ation

tube illustrate the character of the flow)


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INTRODUCTION:

Reynolds number is a dimensionless =uantity that is used to help predict similar fluid

flow situations) owe*er, sborne Reynolds disco*ered that the

flow type mainly depends on the ratio of inertial forces to *iscous forces) This ratio is

what we call as Reynolds number)


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DICUION:

0ccording to the Reynold?s eperiment, laminar flow is determined when the Reynolds

number less than # whereas turbulent flow is determined when the Reynolds number

more than ") @ut according to our Reynolds eperiment, the data that we recorded for

some flow types not in range between the actual Reynolds number) The Reynolds number

of transitional is A"#)"" and turbulent is #"58 where the both flow types are not in range

between the actual Reynolds number) The reason is we did not measured the length of the

dye filament from the starting point until the end point where the flow condition is lasted

in order to maintain the length in the net two sets of data) So that, there are big

differences in time and *elocity calculation if we compared to other set of data)

2e assumed that the speed of water flow rate change the flow type)


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CONC!UION:

igh speed of water flow rate indicate that *iscous forces are small and the flowessentially negligible *iscous)


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EPERIENT REU!T:

!INR

V/e T1(

T2(

T3(

Tve*;e(

"' *$e=

/3&(

Ve)+$V

/&(

200 /! 8A) 1()8 #%)" 8#) #)"#1(1$ )(8

TRNITION!V/e T1

(

T2

(

T3

(

Tve*;e

(

"' *$e

=

/3&(

Ve)+$

V

/&(

200 /! A)8 ##)8 #1) (8)" 5)#81$

)(

TURBU!ENTV/e T1

(

T2

(

T3

(

Tve*;e

(

"' *$e

=

/3&(

Ve)+$

V

/&(

200 /! 1)8 8)" 15) 11) 1)A#"11$5 )#1%5

/%e ))$+:

= > ! > )# 4 #)"#1( 1$m(6s

( 8#)

V > = > )#" 4 #)"#1( 1$ m(6s 4 )(8 m6s

E !)1 A)85" 1$5m#

"

Re > V?D > !)(8&!)1& 4 ("")% + #, .aminar flow

v )8%( 1$


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@e$


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PPRTU:


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2here3

e$e*+; $,:open and ad:ust the speed of the dye to mo*e thorough obser*ation

tube)

Ove*@' $,e:pre*ent o*erflow water by directing the etra water into the waste

water discharge)

A(( ($e(: use to make the mo*ement of water smoothly)

De *e(e*v+*: source of dye supply


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PPENDI:


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Reynold's Number Demonstration.doc

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