Numerical Investigation of Finned-Tube Heat-exchanger with Circular, Elliptical and Rectangular Tubes

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Engineering

Numerical Investigation of Air Side Performance
of Finned-Tube Heat Exchanger with
Combination of Circular
and Elliptical tubes.
Supervised by Submitted by
Dipayan Mondal Md. Hasibul Hasan
Assistant Professor Roll: 1205027
Department of Mechanical Engineering Section: B
Khulna University of Engineering & Technology
Course No. ME 4000

Outline
 Reasons of work
 Introduction
 Objectives
 Theoretical Concepts
 Expected Results
 Work Plan

Reasons of Work
Circular tube has high pressure drop.
Elliptical tube gives better aerodynamic shape.
Combination of both tubes gives high heat
transfer.
Fins that increase heat transfer in Heat
exchanger at low inlet velocity of air.

Objectives
To design & numerically investigate of a finned
tube heat exchanger.
To determine pressure drop around the tube of heat
exchanger.
To select a proper type of fin, suitable for finned
tube heat exchanger.
To enhance overall heat transfer co-efficient.

Theoretical Concepts
 Finned-tube heat exchangers with multiple-rows of tubes.
 Herringbone or wavy fin gives high heat transfer between 0-50 degree.
 Use of vortex generator that enhances heat transfer.
Fig 1: Model of smooth wavy fin elliptical tube with vortex generator.

Theoretical Concepts
• Elliptical tube reduces drag
force.
• air velocity for laminar flow
only.
• Wavy fin increases turbulence
around the tube.
• Vortex generator helps to create
(a) developing boundary layer
(b) swirling.
Fig 2: Top view of the central computation domain.

Expected Results
Pressure drop around the tube as low as
possible.
Increasing the heat transfer at low inlet
velocity.

Work Plan
Tasks No of Cycle Duration
Study 1-3 3 Week
Determining
method to be used
4 1 Week
Numerical Analysis 5-9 5 Week
Result Evaluation 10-11 2 Week
Final report writing 12-13 2 Week

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Numerical Investigation of Finned-Tube Heat-exchanger with Circular, Elliptical and Rectangular Tubes

1. Numerical Investigation of Air Side Performance of Finned-Tube Heat Exchanger with Combination of Circular and Elliptical tubes. Supervised by Submitted by Dipayan Mondal Md. Hasibul Hasan Assistant Professor Roll: 1205027 Department of Mechanical Engineering Section: B Khulna University of Engineering & Technology Course No. ME 4000

2. Outline  Reasons of work  Introduction  Objectives  Theoretical Concepts  Expected Results  Work Plan

3. Reasons of Work Circular tube has high pressure drop. Elliptical tube gives better aerodynamic shape. Combination of both tubes gives high heat transfer. Fins that increase heat transfer in Heat exchanger at low inlet velocity of air.

4. Objectives To design & numerically investigate of a finned tube heat exchanger. To determine pressure drop around the tube of heat exchanger. To select a proper type of fin, suitable for finned tube heat exchanger. To enhance overall heat transfer co-efficient.

5. Theoretical Concepts  Finned-tube heat exchangers with multiple-rows of tubes.  Herringbone or wavy fin gives high heat transfer between 0-50 degree.  Use of vortex generator that enhances heat transfer. Fig 1: Model of smooth wavy fin elliptical tube with vortex generator.

6. Theoretical Concepts • Elliptical tube reduces drag force. • air velocity for laminar flow only. • Wavy fin increases turbulence around the tube. • Vortex generator helps to create (a) developing boundary layer (b) swirling. Fig 2: Top view of the central computation domain.

7. Expected Results Pressure drop around the tube as low as possible. Increasing the heat transfer at low inlet velocity.

8. Work Plan Tasks No of Cycle Duration Study 1-3 3 Week Determining method to be used 4 1 Week Numerical Analysis 5-9 5 Week Result Evaluation 10-11 2 Week Final report writing 12-13 2 Week

9. Thank You

Numerical Investigation of Finned-Tube Heat-exchanger with Circular, Elliptical and Rectangular Tubes

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