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Journal of Enhanced Heat Transfer

Publication de 8  numéros par an

ISSN Imprimer: 1065-5131

ISSN En ligne: 1563-5074

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Indexed in

AN EXPERIMENTAL AND NUMERICAL STUDY OF FLOW AND HEAT TRANSFER IN RIBBED CHANNELS WITH LARGE RIB PITCH-TO-HEIGHT RATIOS

Volume 20, Numéro 4, 2013, pp. 305-319
DOI: 10.1615/JEnhHeatTransf.2014010155
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RÉSUMÉ

This paper presents an experimental and numerical study of flow and heat transfer char teristics in rectangular cross-section ribbed channels with continuous transverse ribs with large pitch-to-height ratios. Five ribs are regularly placed on the bottom wall of the channels with varied rib pitch-to-height ratios ranging from 10 to 30. The channel inlet Reynolds number ranges from 57,000 to 127,000 based on the channel hydraulic diameter. The studied geometry is relevant for hot internal structures in aircraft engines. In this study, the steady state, liquid crystal thermography (LCT) technique is used to obtain detailed heat transfer coefficients in the inter-rib surface regions. Then a computational fluid dynamics (CFD) technique based on the solution of the Reynolds-averaged Navier-Stokes (RANS) equations is employed to study flow and heat transfer characteristics in ribbed channels. The realizable k − ε turbulence model is used as the turbulence closure. The numerical results show a good agreement with the experimental data. An important purpose of this study is to investigate the flow and heat transfer behavior between the first repeated ribs, i.e., in the regions where the flow and thermal fields are not yet periodically fully developed.

CITÉ PAR
  1. Sundén Bengt, , 49, 2017. Crossref

  2. Mikheev N I, Gazizov I M, Davletshin I A, Heat transfer in pulsating flow behind a rib in the channel inlet region, Journal of Physics: Conference Series, 1105, 2018. Crossref

  3. Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Numerical Simulation of Integral Roughness, Laminar Flow in Tubes with Roughness and Reynolds Analogy for Heat and Momentum Transfer, in Insert Devices and Integral Roughness in Heat Transfer Enhancement, 2020. Crossref

  4. Dushin N. S., Mikheev N. I., Dushina O. A., Davletshin I. A., Zaripov D. I., Near-Wall Heat and Mass Transfer in a Channel behind a Rib, Russian Aeronautics, 62, 3, 2019. Crossref

  5. Davletshin I.A., Mikheev A.N., Mikheev N.I., Shakirov R.R., Heat transfer and structure of pulsating flow behind a rib, International Journal of Heat and Mass Transfer, 160, 2020. Crossref

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