Microjet array impingement heat transfer crossflow effects in single-phase and flow boiling

Authors
Werneke, Brian M.
ORCID
Loading...
Thumbnail Image
Other Contributors
Jensen, M. K.
Peles, Yoav
Borca-Tasçiuc, Theodorian
Plawsky, Joel L., 1957-
Issue Date
2015-12
Keywords
Mechanical engineering
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
Microjet array performance steadily decreased with increasing crossflow. Baseline heat transfer coefficients were reduced by 20-40% at a critical jet-to-channel mass flux ratio of 1. For greater ratios, the single-phase and flow boiling array impingement heat transfer asymptotically approached performance characteristics associated with microchannel flow. Microchannel mass flow ranged 380<G_ch<10500 kg/m2-s and corresponded to simultaneously developing flow conditions. Single-phase microchannel heat transfer ranged 15<Nu_ch<115 for 450<Re_ch<8340. Microchannel flow boiling enhanced the single-phase heat transfer rates by 22% and increased CHF as much as 88% depending on the flow conditions. Increased mass flow and subcooling improved ONB by lowering superheat and increasing the heat flux. The peak microchannel flow performance dissipated 160W/cm2 at ΔT_sat=30ºC with a heat transfer coefficient of 22750W/m2-K.
Description
December 2015
School of Engineering
Department
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
Access
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.