Academic Journal
A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations
| العنوان: | A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations |
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| المؤلفون: | O'Shaughnessy, Seamus |
| سنة النشر: | 2022 |
| المجموعة: | The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive) |
| مصطلحات موضوعية: | Pulsating flow, Minichannels, Hydrodynamic study, Heat transfer enhancement, Numerical analysis |
| الوصف: | PUBLISHED ; The development of current and next generation high performance electronic devices has led to smaller components in more densely packed spaces. The increasing power levels have resulted in ever-increasing heat flux densities which necessitates the evolution of new liquid-based heat exchange technologies. Pulsating flow in single-phase cooling systems is viewed as a potential solution to the problems involving high heat flux densities. A review of published literature indicates a lack of time-resolved and space-resolved links between the hydrodynamic pulsating characteristics and associated heat transfer perturbations. The scope of this work involves the development of a validated three-dimensional conjugate heat transfer computational model to investigate hydrodynamically and thermally fully developed pulsating flows in a heated rectangular minichannel. Simulations were performed for a sinusoidal waveform with a fixed pulsation amplitude for varying pulsation frequencies in the range of 0.02 Hz to 25 Hz, corresponding to Womersley numbers in the range of 0.5 18.33. Low pulsation frequencies exhibited the well known parabolic profile for the fluctuating hydrodynamic and thermal parameters, i.e., velocity, wall shear, and wall temperature. As a result, the axial pressure gradient, velocity, and wall shear stress profiles were in phase and similar results were obtained for the oscillating wall and bulk fluid temperatures. For the inertia dominated high frequency flows, an increase in axial pressure gradient leads to a phase lag of /2 when compared with the velocity and wall shear profiles. The shorter time period pulsations exhibit unique attributes in the form of flow reversal effects at local near wall regions. High near wall thermal gradients were observed as a result of stronger viscous effects due to a narrowing thermal boundary layer; consequently the transverse diffusion of heat was ineffective. A phase lag and a subsequent drop in the peak magnitudes existed between the oscillating bulk and wall ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| Relation: | International Journal of Thermal Sciences; 182; P.S. Kumavat, S. Alimohammadi, S.M. O'Shaughnessy, A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations, International Journal of Thermal Sciences, 182, 2022, 107790; Y; http://hdl.handle.net/2262/101490; http://people.tcd.ie/oshaugse; 247135; http://dx.doi.org/10.1016/j.ijthermalsci.2022.107790; orcid:0000-0001-6567-3378 |
| DOI: | 10.1016/j.ijthermalsci.2022.107790 |
| الاتاحة: | http://hdl.handle.net/2262/101490 http://people.tcd.ie/oshaugse https://doi.org/10.1016/j.ijthermalsci.2022.107790 |
| Rights: | Y ; openAccess |
| رقم الانضمام: | edsbas.17FCBCAD |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.ijthermalsci.2022.107790 |
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