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Effects of pin fin configurations on heat transfer and friction factor in an improved lamilloy cooling structure

Luo, Lei; Wang, Chenglong LU ; Wang, Lei LU ; Sundén, Bengt LU and Wang, Songtao (2017) In Heat Transfer Research 48(7). p.657-679
Abstract

In this study, numerical simulations are conducted to investigate the effects of pin fin location, pin fin diameter, and pin fin shape on the target and pin fin surfaces heat transfer as well as friction factor in an improved Lamilloy cooling structure. The pin fin normalized location is varied from 0.35 to 0.65 while the pin fin diameter is changing from 15 mm to 60 mm. Cone-shaped pin fins are introduced, and the root to roof diameter ratio of the cone-shaped pin fin is ranging from 0.5 to 2. The Reynolds number is between 10,000 and 50,000. Results of the target and pin fin surfaces Nu number, friction factor, and flow structures are included. For convenience of comparison, the Lamilloy cooling structure whose pin fin normalized... (More)

In this study, numerical simulations are conducted to investigate the effects of pin fin location, pin fin diameter, and pin fin shape on the target and pin fin surfaces heat transfer as well as friction factor in an improved Lamilloy cooling structure. The pin fin normalized location is varied from 0.35 to 0.65 while the pin fin diameter is changing from 15 mm to 60 mm. Cone-shaped pin fins are introduced, and the root to roof diameter ratio of the cone-shaped pin fin is ranging from 0.5 to 2. The Reynolds number is between 10,000 and 50,000. Results of the target and pin fin surfaces Nu number, friction factor, and flow structures are included. For convenience of comparison, the Lamilloy cooling structure whose pin fin normalized location is 0.5 with a pin fin diameter of 30 mm is studied as the baseline. It was found that with increase of the pin fin normalized location, the heat transfer on the pin fin surfaces is gradually decreased while the friction factor shows a lower value as the pin fins are positioned either near the impingement center or the film holes. This trend is also found for increasing the pin fin diameter. In addition, the heat transfer on the pin fin surface is increased remarkably by using a coneshaped pin fin with a slight target surface heat transfer penalty. It was also found that by changing the pin fin location, pin fin diameter, and the pin fin shape, it may reach 7.6% higher values than the baseline thermal performance based on the target surface Nu number while it is 43.58% based on the pin fin surface.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cone-shaped, Friction factor, Heat transfer, Lamilloy, Pin fin
in
Heat Transfer Research
volume
48
issue
7
pages
23 pages
publisher
Begell House
external identifiers
  • scopus:85021267481
  • wos:000404247900005
ISSN
1064-2285
DOI
10.1615/HeatTransRes.2016013575
language
English
LU publication?
yes
id
0f3a9417-b207-4fea-805b-4f07eaa0e6e8
date added to LUP
2017-07-12 14:33:56
date last changed
2017-09-18 11:38:16
@article{0f3a9417-b207-4fea-805b-4f07eaa0e6e8,
  abstract     = {<p>In this study, numerical simulations are conducted to investigate the effects of pin fin location, pin fin diameter, and pin fin shape on the target and pin fin surfaces heat transfer as well as friction factor in an improved Lamilloy cooling structure. The pin fin normalized location is varied from 0.35 to 0.65 while the pin fin diameter is changing from 15 mm to 60 mm. Cone-shaped pin fins are introduced, and the root to roof diameter ratio of the cone-shaped pin fin is ranging from 0.5 to 2. The Reynolds number is between 10,000 and 50,000. Results of the target and pin fin surfaces Nu number, friction factor, and flow structures are included. For convenience of comparison, the Lamilloy cooling structure whose pin fin normalized location is 0.5 with a pin fin diameter of 30 mm is studied as the baseline. It was found that with increase of the pin fin normalized location, the heat transfer on the pin fin surfaces is gradually decreased while the friction factor shows a lower value as the pin fins are positioned either near the impingement center or the film holes. This trend is also found for increasing the pin fin diameter. In addition, the heat transfer on the pin fin surface is increased remarkably by using a coneshaped pin fin with a slight target surface heat transfer penalty. It was also found that by changing the pin fin location, pin fin diameter, and the pin fin shape, it may reach 7.6% higher values than the baseline thermal performance based on the target surface Nu number while it is 43.58% based on the pin fin surface.</p>},
  author       = {Luo, Lei and Wang, Chenglong and Wang, Lei and Sundén, Bengt and Wang, Songtao},
  issn         = {1064-2285},
  keyword      = {Cone-shaped,Friction factor,Heat transfer,Lamilloy,Pin fin},
  language     = {eng},
  number       = {7},
  pages        = {657--679},
  publisher    = {Begell House},
  series       = {Heat Transfer Research},
  title        = {Effects of pin fin configurations on heat transfer and friction factor in an improved lamilloy cooling structure},
  url          = {http://dx.doi.org/10.1615/HeatTransRes.2016013575},
  volume       = {48},
  year         = {2017},
}