ME LABORATORY – POST LABORATORY REPORT RUBRIC
EXPERIMENT NUMBER & TITLE:​ Experiment 1 – Osbourne Reynolds Demonstrator
GROUP NO.: ​4
​SECTION: ​3ME – D
​DATE OF EXPERIMENT: ​03/08/2021
GROUP MEMBERS:
BANDIOLA, Jonathan
DAMO, Mark David
CATAGUE, Jazalle
WATANABE, Asuka
EXPERIMENT OBJECTIVES:
● To visualize the difference between laminar and turbulent flows
● To calculate the Reynolds number of various flows
INTRODUCTION:
In fluids, laminar flow occurs in low-speed moving fluids with high viscosity. In turbulent flow, it
is usually described by fluid particle mixing and random motion, and there is a large energy exchange in
the entire fluid. In the flow that occurs in high-speed and low-viscosity fluids. Transition flow is a mixture
of laminar flow and turbulent flow. Laminar flow is near the edge and turbulent in the center of the pipe.
The Reynolds number is helpful in classifying the state of flow.
DATA SHEET:
Type of Flow
Collected Volume
Time Taken
Temperature
Laminar
200mL
18.19s
32.2​°C
Transitional
450mL
18.76s
31.8​°C
Turbulent
500mL
10.38s
33.4​°C
RESULTS, CALCULATIONS, and DISCUSSION:
A. RESULTS:
A.1. FOR LAMINAR FLOW:
A.2. FOR TRANSITION FLOW:
A.3. FOR TURBULENT FLOW:
B. CALCULATIONS:
B.1. FOR LAMINAR FLOW:
B.2. FOR TRANSITIONAL FLOW:
B.3. TURBULENT FLOW:
C. DISCUSSION:
Dimensions of the apparatus are utilized in the applicable calculations. If it happens to be needed,
measure them to be able to be assure that they are accurate:
Diameter of the test pipe:​ d = 0.010m
Cross sectional area calculated: ​A = 7.853981634 x 10−5 m2
Each flow’s Reynolds number was calculated using the obtained data. Each flow showed the
laminar, transitional, or turbulent flow. They're Reynolds numbers were all calculated, with laminar
flow’s The Reynolds number is calculated as 1819.7866, and the laminar flow range entered is less than
2300. Laminar flow happens at low velocities, where the layers of fluid seem to slide by one another
without distortion/ swirls present. For the transition stream, the obtained value is 3940.853926, and the
range of transition stream is 2300 <x <4000. It can be observed that the dye stream will wander about and
show occasional bursts of mixing. Finally, the Reynolds number of the turbulent flow is 8154.164422,
and the incoming flow range is greater than 4000. Happens at higher velocities are called Turbulent flow.
The increase in water flow changes the blue dye line. The change of the shape can be seen from a
thin thread to slightly eddies, which include smooth thin threads and followed by a full swirl. This
phenomenon does not happen suddenly, it can be observed that it varies from laminar flow to transitional
followed by a turbulent flow. Until the flow is formed, the water inlet valve and outlet valve must be
controlled.
IMPORTANCE OF THE EXPERIMENT PERFORMED:
Reynolds numbers provide engineers with instant information about the conditions that flow
through streams, soils, and pipes. Applying proper relationships to help solve the problem at hand. For
instance, the force acting on a ship that is being read in the lab for configuration purposes, then the
Reynolds number of the flow acting on the model in the lab and the model on the field should be
equivalent.
CONCLUSION:
Laminar, turbulent, or transitional are the characteristics of how a flow of fluid occurs. In an
orderly manner with particles close to a solid surface acting in straight lines parallel to the surface is the
movement of the fluid particles. If the value of Reynolds number is below 2100, it is called a Laminar
Flow. In turbulent flow, the Reynolds number is greater than 4000. Also, it can be observed that in
turbulent flow there’s a lateral mixing and the motion of the particles is inchoate. In the transition flow,
the Reynolds number is between 2100 and 4000.
We can conclude, the relationship between the water flow rate and Reynolds numbers is
proportionate. Also, the function of the flow rate can be discovered in Reynolds numbers.
REFERENCE/S:
● Lab Manual(Osborne Reynolds Demonstrator)
● Reynolds Number: Introduction and Definition of the Dimensionless Reynolds Number.
Retrieved from ​https://www.engineeringtoolbox.com/reynolds-number-d_237.html
● Reynolds
Number.
(2016,
September
7).
Retrieved
from
https://byjus.com/physics/reynolds-number/