Abstract
Heat transfer characteristics of the swirling impinging jet-arrays issued from the nozzle plates without and with the # and ※patterned grooves were comparatively studied. Each swirling jet was induced by the twisted tape with 1 or 2 twist pitches in the nozzle. The detailed Nusselt number distributions over the impingement surface for the six types of swirling jet-arrays were measured using the infrared thermography method at jet Reynolds numbers and nozzle-to-plate distances between 1500-20000 and 0.1–8 nozzle diameters respectively. A selective set of experimental results illustrated the effects of jet Reynolds number, nozzle-to-plate distance and the grooves on the local and regionally averaged heat transfer performances with the heat transfer uniformity over the impingement surface examined. In conformity with the effects of jet Reynolds number and nozzle-to-plate distance disclosed by the present study, a set of heat transfer correlations that evaluated the average Nusselt numbers over the central jet region of the swirling impinging jet-arrays issued from the nozzle plates without and with the grooves were generated.
| Original language | English |
|---|---|
| Article number | 106155 |
| Journal | International Journal of Thermal Sciences |
| Volume | 148 |
| DOIs | |
| Publication status | Published - 2020 Feb |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Engineering(all)
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Heat transfer characteristics of swirling impinging jet-arrays issued from nozzle plates with and without webbed grooves. / Chang, Shyy Woei; Shen, Hong Da.
In: International Journal of Thermal Sciences, Vol. 148, 106155, 02.2020.Research output: Contribution to journal › Article
TY - JOUR
T1 - Heat transfer characteristics of swirling impinging jet-arrays issued from nozzle plates with and without webbed grooves
AU - Chang, Shyy Woei
AU - Shen, Hong Da
PY - 2020/2
Y1 - 2020/2
N2 - Heat transfer characteristics of the swirling impinging jet-arrays issued from the nozzle plates without and with the # and ※patterned grooves were comparatively studied. Each swirling jet was induced by the twisted tape with 1 or 2 twist pitches in the nozzle. The detailed Nusselt number distributions over the impingement surface for the six types of swirling jet-arrays were measured using the infrared thermography method at jet Reynolds numbers and nozzle-to-plate distances between 1500-20000 and 0.1–8 nozzle diameters respectively. A selective set of experimental results illustrated the effects of jet Reynolds number, nozzle-to-plate distance and the grooves on the local and regionally averaged heat transfer performances with the heat transfer uniformity over the impingement surface examined. In conformity with the effects of jet Reynolds number and nozzle-to-plate distance disclosed by the present study, a set of heat transfer correlations that evaluated the average Nusselt numbers over the central jet region of the swirling impinging jet-arrays issued from the nozzle plates without and with the grooves were generated.
AB - Heat transfer characteristics of the swirling impinging jet-arrays issued from the nozzle plates without and with the # and ※patterned grooves were comparatively studied. Each swirling jet was induced by the twisted tape with 1 or 2 twist pitches in the nozzle. The detailed Nusselt number distributions over the impingement surface for the six types of swirling jet-arrays were measured using the infrared thermography method at jet Reynolds numbers and nozzle-to-plate distances between 1500-20000 and 0.1–8 nozzle diameters respectively. A selective set of experimental results illustrated the effects of jet Reynolds number, nozzle-to-plate distance and the grooves on the local and regionally averaged heat transfer performances with the heat transfer uniformity over the impingement surface examined. In conformity with the effects of jet Reynolds number and nozzle-to-plate distance disclosed by the present study, a set of heat transfer correlations that evaluated the average Nusselt numbers over the central jet region of the swirling impinging jet-arrays issued from the nozzle plates without and with the grooves were generated.
UR - http://www.scopus.com/inward/record.url?scp=85074361510&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074361510&partnerID=8YFLogxK
U2 - 10.1016/j.ijthermalsci.2019.106155
DO - 10.1016/j.ijthermalsci.2019.106155
M3 - Article
AN - SCOPUS:85074361510
VL - 148
JO - International Journal of Thermal Sciences
JF - International Journal of Thermal Sciences
SN - 1290-0729
M1 - 106155
ER -