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ISSN 打印: 1065-5131

ISSN 在线: 1563-5074

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Indexed in

Flow and Heat Transfer in a Rectangular Duct with Single Rib and Two Ribs Mounted on the Bottom Surface

卷 10, 册 2, 2003, pp. 171-198
DOI: 10.1615/JEnhHeatTransf.v10.i2.50
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摘要

An experimental investigation of fluid flow and heat transfer for a single rib and two ribs mounted on the bottom surface of a rectangular channel at Re of 13,400, 22,600, and 32,100 has been carried out. The pitch-to-rib height ratio set during the experiment is equal to 10, and rib-height-to-hydraulic-diameter ratio is equal to 0.0624. The mean velocity and its fluctuations from hot-wire anemometry, mean temperature and its fluctuation from resistance thermometry and the surface Nusselt number from transient liquid crystal thermography are presented. The Nusselt number results obtained from the transient LCT analysis satisfy the energy balance check and correlate well with that from the law of the wall. No large-scale structures are observed in the spanwise direction near the reattachment region showing the overall two-dimensional nature of the flow. The temperature fluctuation has two peaks in the near-field region: one peak at similar cross-stream location to that of the velocity fluctuations and the other close to the wall. The velocity and temperature fluctuation have a flatter distribution in the far-field region than in the near-field region, indicating that turbulence production is important in the near-field region, while other mechanisms such as dissipation, convection, and diffusion predominate in the far-field region. The entropy generation calculation revealed that the two-rib case at Re = 32,100 is most advantageous from the thermodynamic point of view, with a 16% drop in entropy generation and a 47% heat transfer augmentation.

对本文的引用
  1. Dabiri Dana, Digital particle image thermometry/velocimetry: a review, Experiments in Fluids, 46, 2, 2009. Crossref

  2. Panigrahi P. K., Tariq A., Liquid crystal heat transfer measurements in a rectangular channel with solid and slit rib, Journal of Visualization, 6, 4, 2003. Crossref

  3. Tariq Andallib, Panigrahi P. K., Muralidhar K., Flow and heat transfer in the wake of a surface-mounted rib with a slit, Experiments in Fluids, 37, 5, 2004. Crossref

  4. Das Malay K., Tariq A., Panigrahi P. K., Muralidhar K., Estimation of convective heat transfer coefficient from transient liquid crystal data using an inverse technique, Inverse Problems in Science and Engineering, 13, 2, 2005. Crossref

  5. Ranjan R., Pantano C., Fischer P., Direct simulation of turbulent heat transfer in swept flow over a wire in a channel, International Journal of Heat and Mass Transfer, 54, 21-22, 2011. Crossref

  6. Ali Md Shaukat, Tariq Andallib, Gandhi B. K., Flow and heat transfer investigation behind trapezoidal rib using PIV and LCT measurements, Experiments in Fluids, 54, 5, 2013. Crossref

  7. Panigrahi P. K., Muralidhar K., Visualization of Convective Heat Transfer, in Handbook of Thermal Science and Engineering, 2017. Crossref

  8. Sharma Naveen, Tariq Andallib, Mishra Manish, Experimental Investigation of Heat Transfer Enhancement in Rectangular Duct with Pentagonal Ribs, Heat Transfer Engineering, 40, 1-2, 2019. Crossref

  9. Kumar Surya, Tariq Andallib, Steady state experimental investigation of thermal contact conductance between curvilinear contacts using liquid crystal thermography, International Journal of Thermal Sciences, 118, 2017. Crossref

  10. Panigrahi Pradipta K., Muralidhar K., Visualization of Convective Heat Transfer, in Handbook of Thermal Science and Engineering, 2018. Crossref

  11. Ali Md Shaukat, Tariq Andallib, Gandhi B. K., Role of Chamfering Angles and Flow Through Slit on Heat Transfer Augmentation Behind a Surface-Mounted Rib, Journal of Heat Transfer, 138, 11, 2016. Crossref

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