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RISS 인기검색어
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- 저자 : Gereltbyamba, Battsetseg (검색결과 2 건)
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Flow modification by inertial particles in a differentially heated cubic cavity
Gereltbyamba, Battsetseg,Lee, Changhoon Elsevier 2019 The International journal of heat and fluid flow Vol.79 No.-
<P><B>Abstract</B></P> <P>In this study, we analyzed particle-laden flow in a differentially heated cubic cavity by using direct numerical simulations and the Lagrangian particle tracking method. The main purpose of this study was to investigate the physical mechanism responsible for the modification of natural convection flow by sedimenting solid particles. Rayleigh number of R a = <SUP> 10 6 </SUP> was considered, and two important parameters, namely, the particle diameter <I>d<SUB>p</SUB> </I> and particle volume fraction Φ<SUB> <I>V</I> </SUB>, were varied in the range of <SUB> d p </SUB> = 25 , 35 , 50 , 75 μ m and <SUB> Φ V </SUB> = 2 × <SUP> 10 − 5 </SUP> , 5 × <SUP> 10 − 5 </SUP> , <SUP> 10 − 4 </SUP> . Extensive numerical investigations were performed by considering the two-way interaction for the following two coupling cases: (i) momentum coupling only; (ii) momentum and thermal coupling between fluid and particles. Behavior of particles, flow modification, and heat transfer characteristics were investigated in detail with the relevant statistics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the modification of natural convection flow in a differentially heated cavity filled with air by sedimenting small particles by using direct numerical simulation. </LI> <LI> We investigated two cases, namely, momentum coupling and both momentum and thermal coupling. The major parameters were the particle diameter and particle volume fraction. </LI> <LI> For the momentum coupling case, the particles enhanced the circulatory motion, thus making the flow chaotic. Heat transfer is overall slightly suppressed by particles. </LI> <LI> However, for the momentum and thermal coupling case, the thermal energy exchange between the particles and fluid yields completely different behavior than the momentum coupling case. </LI> <LI> The flow became less chaotic which might be attributed to the conjecture that the chaotic motion is suppressed by thermal diffusive processes due to the active thermal interaction between the particles and fluid. </LI> <LI> As a result, heat transfer is suppressed more than the momentum coupling case through the direct and indirect interactions between the sedimenting particles and fluid. </LI> </UL> </P>
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Battsetseg Gereltbyamba,이창훈 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
This study is related to the transport of inertial particles in a differentially heated cubic cavity. Three moderate values of the Rayleigh number 8 8 8 Ra = 2 ´10 , 4 ´10 , 7 ´10 are considered. There is no back reaction from the particle on the flow, i.e., one-way coupling. Small ( d = 15 mm ) , intermediate ( d = 35 mm ) , and large ( d = 75 mm ) sizes of particles are used to study the particle behavior. The particles are influenced by two forces, the drag and gravity force. From our simulations, we observed that a large fraction of smallsized particles follow the flow motion and they are not significantly affected by gravity, remaining suspended in the flow. On the other hand, large-sized particles quickly settle down toward the bottom wall under gravity and are deposited at the bottom wall. Owing to this difference, particle distribution for small particles and large particles is quite different. Small particles tend to accumulate near a particular region near hot and cold walls, while the particle depletion region is observed in the core region in a particular pattern. Large particles are almost uniformly distributed. Detailed mechanisms are discussed using the flow field and particle response characteristics.
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