Laminar flow and heat transfer charateristics in a channel with triangular wavy baffle

ลักษณะการไหลแบบราบเรียบและการถ่ายเทความร้อนในช่องที่มีแผ่นกั้นรูปคลื่นแบบสามเหลื่ยม

Name: Somchai Sripattanapipat

ThaSH: Heat -- Transmission.

ThaSH: Electrical Engineering -- Thesis (Degree of Doctor)

ThaSH: King Mongkut's Institute of Technology Ladkrabang. -- Electrical Engineering Engineering -- Thesis.

Abstract: The thesis presents a numerical analysis of laminar periodic flow and heat transfer in a rectangular constant temperature-surfaced channel with triangular wavy baffles. The triangular wavy baffles are introduced and mounted on the opposite walls of the rectangular channel with inline arrangements. The triangular wavy baffles are placed on the upper and lower walls with the baffle inclination angle or attack angle ( ) of 30, 45, 60, and 90 and the baffle height ratio or blockage ratio, BR = b/H = 0.050 - 0.300 for each the angle. For the 45, 60, and 90 triangular wavy baffles, only single pitch ratio, PR=1.0, is used. The pitch ratio of the 30 triangular wavy baffles is varied from 0.5 to 2.0. The fluid flow and heat transfer characteristics are presented for Reynolds number (Re) values ranging from Re = 100 to 1000. A commercial program, namely FLUENT, is used in the current study. The computational results are shown in the topology of flow and heat transfer. It is found that the heat transfer in the channel with the wavy baffle is more effective than that with no baffle. The increase in the blockage ratio, BR leads to a considerable increase in the Nusselt number and friction factor. In addition, the investigation of flow structure shows that the reduction in the angle of attack helps to create longitudinal vortex flows which enhance heat transfer and reduce pressure loss in the channel. The computational result reveals that the maximum value of the thermal enhancement factor, is found to be 2.33 for using the 30 triangular wavy baffle with BR=0.075 and PR=1.00 at the highest Reynolds number regime.

King Mongkut's Institute of Technology Ladkrabang. Central Library

Address: Bangkok

Email: Lifelong@kmitl.ac.th

Name: Pongjet Promvonge

Role: Thesis Advisor

Email : kppongje@kmitl.ac.th

Created: 2010

Modified: 2558-08-17

Issued: 2558-08-17

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: Thesis S62l 2010

tha

DegreeName: Doctor of Engineering (Mechanical Engineering)

Level: Doctoral Degree

Descipline: Mechanical Engineering

Grantor: King Mongkut's Institute of Technology Ladkrabang

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