Impingement/effusion cooling with a hollow cylinder structure for additive manufacturing

Minho Bang, Sangjae Kim, Seungyeong Choi, Ho Seong Sohn, Hyung Hee Cho

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of this study is to investigate heat transfer characteristics in new laminated plates having impingement/effusion cooling with a hollow cylinder structure. Three perforated plates are set up in parallel position to model impingement/effusion cooling system with a hollow cylinder structure. Local heat/mass transfer coefficients on all surfaces including upper surface of bottom plate, lower surface of mid plate, upper surface of mid plate, and lower surface of top plate in a new structure are obtained using the naphthalene sublimation method. The ratio of channel height to hole diameter, h/D, and the ratio of hole pitch to hole diameter, P/D, are fixed at 0.5 and 6, respectively. The range of the Reynolds number based on the hole diameter is from 2,000 to 7,000. For all tested surfaces, local Sherwood number shows high values near the stagnation region and at the regions where flow acceleration to the effusion hole occurs. A similar trend of the area-averaged Sherwood numbers on all tested surfaces except upper surface of bottom plate appears because of the flow regime variations depending on the Reynolds numbers. The new structure has higher value than existing other multi-layered structures, with an improvement of 32.4% in heat/mass transfer and 24.4% in thermal performance factor at ReD = 5,000. A correlation between the area-averaged Sherwood number and the Reynolds number is obtained. This proposed structure will improve the thermal durability and reliability of the hot components of gas turbines by being implemented on hot components of gas turbines using an additive manufacturing.

Original languageEnglish
Article number119786
JournalInternational Journal of Heat and Mass Transfer
Volume155
DOIs
Publication statusPublished - 2020 Jul

Bibliographical note

Funding Information:
This work has been supported by grants from the Energy Technology Development program (No. 20193310100030 ) and the Human Resources Development program (No. 20204030200110 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korea government Ministry of Trade, Industry and Energy.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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