University of the Ryukyus1 Graduate School of Engineering and Science

2 Department of Mechanical Systems Engineering

SUMMER INTERNSHIP PRESENTATION

May 21, 2018 - June 20, 2018

MANISHA MISHRA

Junior Year

Department of Mechanical Engineering

Madan Mohan Malaviya University of Technology,

Gorakhpur, India

Advisor: Prof. Izuru Senaha

CONTENTS

1. FLOW VISUALIZATION AND PIV

➢ Experimental Apparatus

➢ Experimental Conditions

➢ Experimental Results and Discussions

2. MEASUREMENT OF WALL TEMPERATURE WITH AN INFRARED

CAMERA

➢ Cooling Mechanism by Mist Evaporation

➢ Effect of Mist on Temperature Distribution

3. POP-POP BOAT

➢ Principle of Operation of Pop-Pop Boat

➢ Materials Used for Making Pop-Pop Boat

4. ACKNOWLEDGEMENT

1

FLOW VISUALIZATION AND PIV

• It is used to obtain instantaneous velocity

measurements and related properties in fluids.

• Particle image velocimetry (PIV) is an optical

method of flow visualization.

2

Experimental Apparatus

3

Experimental Conditions

Flow velocity, u= 6 m/s

Frame rate= 10000 fps

Orifice diameter, D= 20 mm

Lens-resolution: 20.9 dpi

Inspection area: 32 pixels×32 pixels

Laser output= 1.43 W

Laser sheet thickness=3.3 mm

4

Plate

Jet

High-Speed Camera

Laser

Flow Visualization by Laser Sheet

Method

5

Flow Visualisation

Result 1: In the above figure, the vortex rings of the smoke jet used in the flow

visualization can be seen.

The vectors in the various regions of the jet which indicate the speed and

direction (the velocity field) of the flow being studied are seen.

Experimental Results and Discussions

6

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

-4 -3 -2 -1 0 1 2 3 4

U/U

ma

x

y/y(Um/2)

PIV

tollmien

Flow Velocity= 6 m/s

Frame Rate= 10000 fps

Velocity half width distribution compared with Tollmien solution

Result 2: On comparing the curves for PIV and Tollmien’s solution in the

above figure, we see that they are almost equal. Hence, the result is

satisfactory. 7

MEASUREMENT OF WALL TEMPERATURE

WITH AN INFRARED CAMERA

Plate

Infrared

CameraJet

8

Cooling Mechanism by Mist

Evaporation

Cooled Air

Latent Heat

Spouting

Mist Flow

Main Flow

Mist

Cooling the Wall

Surface

Orifice

9

Effect of Mist on Temperature

Distribution

3020100-10-20-30

X cm

-20

-10

0

10

Y c

m

50

45

40

35

30

25

Without mistUj = 6 m/s

3020100-10-20-30

X cm

-20

-10

0

10

Y c

m

With MistUj= 6 m/s 50

45

40

35

30

25

10

50

45

40

35

30

25

Tem

p.

deg

.C

4003002001000

X mm

Uj = 6 m/s With Mist

Without Mist

Effect of Mist on Temperature

Distribution

11

POP-POP BOAT

Water is pushed out of the

coil as the steam expands.

Vacuum is created inside the

coil and water is drawn inside.

Principle of Operation

of a Pop-Pop Boat

12

12 cm 18 cm

9.1 cm

60°

Dimensions of the Hull of the Pop-Pop Boat

➢ The hull of the boat

was made out of

thermocol.

➢ A coil-type boiler

with 2 exhaust

tubes made out of

Aluminium.

➢ 3 candles.

13

Top View Side View

Bottom View14

15

ACKNOWLEDGEMENT

• I would like to thank Prof. Tomohisa Wada for his constant

support and guidance for the past one month.

• My internship advisor, Prof. Senaha for helping me with the

experiments and for being patient throughout.

• Prof. Matsuda and Prof. Yasuda for being so helpful and for

giving me extra information about the experiments.

• Prof. Yaga for taking us to the best places in Okinawa and for

being so kind.

• My lab partners, Saaya, Yuki, Rihito, Tomoya and Masanao for

their help at every point and without whom my internship wouldn’t

have been so exciting.

• I am extremely grateful to Shiho for always being their for us.

• To all the other professors and students, thank you.

16

19