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Title: NUMERICAL ANALYSIS OF FLOW AND ELECTRIC FIELD EFFECTS ON AN EHD ENHANCED MINI HEAT EXCHANGER

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1399970
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: ASME 2017 Heat Transfer Summer Conference - Bellevue, Washington, United States of America - 7/9/2017 4:00:00 AM-7/12/2017 4:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Mingkan, and Abdelaziz, Omar. NUMERICAL ANALYSIS OF FLOW AND ELECTRIC FIELD EFFECTS ON AN EHD ENHANCED MINI HEAT EXCHANGER. United States: N. p., 2017. Web. doi:10.1115/HT2017-4800.
Zhang, Mingkan, & Abdelaziz, Omar. NUMERICAL ANALYSIS OF FLOW AND ELECTRIC FIELD EFFECTS ON AN EHD ENHANCED MINI HEAT EXCHANGER. United States. doi:10.1115/HT2017-4800.
Zhang, Mingkan, and Abdelaziz, Omar. Sat . "NUMERICAL ANALYSIS OF FLOW AND ELECTRIC FIELD EFFECTS ON AN EHD ENHANCED MINI HEAT EXCHANGER". United States. doi:10.1115/HT2017-4800. https://www.osti.gov/servlets/purl/1399970.
@article{osti_1399970,
title = {NUMERICAL ANALYSIS OF FLOW AND ELECTRIC FIELD EFFECTS ON AN EHD ENHANCED MINI HEAT EXCHANGER},
author = {Zhang, Mingkan and Abdelaziz, Omar},
abstractNote = {},
doi = {10.1115/HT2017-4800},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}

Conference:
Other availability
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  • The reduction of heat exchanger size and volume using electrohydrodynamic (EHD) heat transfer enhancement is attractive for aircraft since weight and volume are critical design variables. Unfortunately, the understanding of the role of fluid properties and flow physics in enhancement performance is poorly understood, which makes intelligent application of the technique difficult. Here, electrohydrodynamic (EHD) heat transfer enhancement in the aviation working fluid polyalphaolefin (PAO) was experimentally examined as a function of fluid properties, flow characteristics and electrical parameters. Using a two-dimensional finite-difference code, the bulk heat transfer coefficients were calculated as a function of these parameters and compared tomore » the experimental results. Implications for future parametric work are discussed.« less
  • The topics covered include benchmark problems for heat transfer analysis programs, natural and mixed convection, numerical methods for heat exchanger design, high heat flux thermal management, and modeling of heat transfer in multiphase systems. Separate abstracts were prepared for most papers in this volume.
  • There is a need to make heat exchangers for refrigeration and air conditioning systems compact in size and light in weight, because they are quite often installed into confined spaces. To meet the need, compact and light heat exchangers including the serpentine, laminated, and parallel flow type heat exchangers have been developed and used rather than the traditional tube heat exchangers. Here, thermal and flow characteristics of a parallel flow heat exchanger have been numerically examined to investigate the effects of its geometrical parameters on thermal performance. Flow nonuniformities along passages of the heat exchanger, which are believed to bemore » dominantly influential to the thermal performance, have been observed to eventually optimize the design of the heat exchanger. The optimization has been done by minimizing the flow nonuniformity that was served as an object function when Newton's searching method was applied. The parameters include locations of separators, and the inlet and outlet of the heat exchanger. It is found that the heat transfer of the optimized model increased approximately 7.6% and the pressure drop decreased 4.7%, compared to those of the base model of the heat exchanger.« less
  • Numerical results are presented for natural convection in an enclosure under the influence of electric field. The geometry considered is a two-dimensional cavity with an aspect ratio of 5. The electrical field is generated by positive corona from an electrode wire charged with a high dc voltage. Three wire locations have been considered, which result in symmetric and non-symmetric electric fields. Numerical calculations have covered a wide range of parameters (i.e., V{sub o} = 12, 15 and 18 kV, 10{sup 3} {le} Ra {le} 10{sup 6}). In the presence of electric field, the flow and temperature fields may reach amore » steady, steady-periodic or non-periodic state. For low Rayleigh numbers, it is observed that the flow and temperature fields are basically oscillatory in nature. When the Rayleigh number is sufficiently increased, a steady state may be reached. Due to the oscillatory flows, there is a significant increase in heat transfer. It is found that heat transfer enhancement increases with the applied voltage but decreases with the Rayleigh number. In addition, it is found that heat transfer enhancement can be maximized by placing the electrode toward the leading edge of the heat transfer surface, that is, to perturb the thermal boundary layer as early as it begins to develop.« less