1. INTRODUCTION TO
BAFFLES
Praveen Kumar( Roll no.T17ME006)
DEPARTMENT OF MECHANICAL ENGINEERINGDEPARTMENT OF MECHANICAL ENGINEERING
NATIONAL INSTITUTE OF TECHNOLOGY MEGHALAYANATIONAL INSTITUTE OF TECHNOLOGY MEGHALAYA1
2. CONTENTS
Introduction
Types of Baffles
Baffle cut
Baffle spacing
Aims of thermal design
References
2
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
3. INTRODUCTION
Baffles serve two purposes:
Divert (direct) the flow across the bundle to obtain a
higher heat transfer coefficient.
Support the tubes for structural rigidity, preventing tube
vibration and sagging.
3
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
4. TYPES OF BAFFLES
Segmental type:
Single – horizontal & vertical
Double
Triple
No-Tubes in Window
Orifice type
Disc and doughnut type
Rod type
4
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
5. Shell side Flow out
Tube side Flow
In
Tube
Bundle
SINGLE SEGMENTAL BAFFLE- Horizontal
Tube side flow out
Shell side flow in
5
(http://elearning.teknik.univpancasila.ac.id, accessed on 15/03/2018)
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
7. Shell Outlet
Shell Inlet
DOUBLE SEGMENTAL TRANSVERSE
BAFFLES7
(http://elearning.teknik.univpancasila.ac.id)
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
8. DOUGHNUT AND DISC TYPE
BAFFLES8
(http://elearning.teknik.univpancasila.ac.id)
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
9. 9
ORIFICE AND ROD TYPE BAFFLES
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
Rod baffleOrifice type baffle
(International Journal of Scientific & Engineering Research,2014)
10. BAFFLE CUT
Height of the segment that is cut in a baffle to permit the
shell- side fluid to flow across the baffle.
Baffle cut should be set carefully because a baffle cut that
is either too large or too small can increase the
possibility of fouling in the shell.
Orientation:
Horizontal for heating or cooling with no phase change
Vertical for shell side condensation
10
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
11. CUT:
15 % to 45 % of shell ID for Single Segmental
25 % to 35 % of shell ID for Double Segmental
11
(http://chemical-eng-world.blogspot.in/2013/05/baffles.html)
Last accessed on 15/03/2018
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
14. AIMS OF THERMAL DESIGN
Achieve the specified duty at minimum overall cost
To achieve high heat transfer coefficient within allowable
pressure drops.
10-20 % Overdesign margin (design safety)
Pressure drops should be in limit.
To keep fluid velocities in limit.
To keep shell side flow fractions in limit.
14
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
15. REFERENCES
Sadik Kakaç & Hongtan Liu (2002). Heat transfer enhancement of heat exchangers
Design (2nd ed.). Series :E applied science vol. 355. CRC Press. ISBN 0-7923-5637-63.
Design of helical baffle in shell and tube heat exchanger and comparing with segmental
baffle using kern method, Dr. B. Jayachandriah and V. Vinay kumar, International
journal of emerging technology in computer science an electronics(IJETCSE).
ISSN:0976-1353 volume 13 issue 2- March 2015.
Ferhad Tehar Nemati, Kazem Razmi, Reza Tasouji Azar, Sirous Zeyninejad Movassag ,
Baffle space impact on the performance of helical baffle shell and tube heat
exchangers, vol. 44, pages 143-149, November 2012.
Chemical engineering world, www.chemical-eng-world.blogspot.in/2013/05/baffles.html
E-Learning, www.elearning.teknik.univpancasila.ac.id/course/index.php?categoryid=9
International Journal of Scientific & Engineering Research, Volume 5, Issue 7, July-
2014 1186. ISSN 2229-5518.
15
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING