Abstract
This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65% greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.
| Original language | English |
|---|---|
| Pages (from-to) | 95-114 |
| Number of pages | 20 |
| Journal | Journal of Enhanced Heat Transfer |
| Volume | 20 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2013 Oct 7 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes
Cite this
}
Heat transfer enhancement for turbulent mixed convection in reciprocating channels by various rib installations. / Perng, Shiang Wuu; Wu, Horng-Wen.
In: Journal of Enhanced Heat Transfer, Vol. 20, No. 2, 07.10.2013, p. 95-114.Research output: Contribution to journal › Article
TY - JOUR
T1 - Heat transfer enhancement for turbulent mixed convection in reciprocating channels by various rib installations
AU - Perng, Shiang Wuu
AU - Wu, Horng-Wen
PY - 2013/10/7
Y1 - 2013/10/7
N2 - This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65% greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.
AB - This paper numerically studies how the rib-pitch, rib-land, and rib-blockage ratios affect the axisymmetric turbulent flow and heat transfer in a reciprocating circular ribbed channel. The pitch ratio (rib-pitch to rib-height ratio of 8, 11, and 22), land ratio (rib-width to rib-height ratio of 0.5, 1.0, and 2.0), and blockage ratio (rib height to channel diameter of 0.05, 0.1, and 0.2) of rib were changed with a constant Reynolds number (10,000) under various Grashof numbers (∼0-400,000,000) and pulsating numbers (0 and 4.64). The average time-mean Nusselt number in the circular ribbed channel is 94.44-184.65% greater than that in the smooth channel undergoing reciprocating motion. The combined effect between buoyancy, reciprocating force, and inlet fluid momentum enhances the heat transfer from the wall in the channel. The turbulent heat transfer from the wall is improved by increasing land and blockage ratios of ribs with decreasing rib-pitch ratio for the channel.
UR - http://www.scopus.com/inward/record.url?scp=84884865034&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884865034&partnerID=8YFLogxK
U2 - 10.1615/JEnhHeatTransf.2013005137
DO - 10.1615/JEnhHeatTransf.2013005137
M3 - Article
AN - SCOPUS:84884865034
VL - 20
SP - 95
EP - 114
JO - Journal of Enhanced Heat Transfer
JF - Journal of Enhanced Heat Transfer
SN - 1065-5131
IS - 2
ER -