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| *Record 1 of 2. *Click Here to View Full Record *Order Full Text [ ] |
| Title: Molecular dynamics-continuum hybrid simulation for condensation of gas flow in a microchannel |
| Authors: |
| Author Full Names: Sun, Jie; He, Ya-Ling; Tao, Wen-Quan |
| Source: MICROFLUIDICS AND NANOFLUIDICS 7 (3): 407-422 NOV 2009 |
| Language: English |
| Document Type: Article |
| Author Keywords: Molecular dynamics; Finite volume method; Multiscale coupling; Hybrid method; Condensation; Micro fluidics |
| KeyWords Plus: ATOMISTIC SIMULATION; FLUID; PARTICLE; RESISTANCE; EQUATION; SURFACE; MODEL |
| Abstract: A molecular dynamics-continuum coupling method combining fluid flow and heat transfer is developed to study the condensation process of gas flow in a microchannel. The computational domain is decomposed into particle (P), continuum (C) and overlap (O) regions with solving approaches of molecular dynamics simulation, finite volume method and the developed coupling method, respectively. Continuities of momentum and energy in O region are ensured by constraint dynamics and the Langevin method. The validity of the developed method is confirmed by a good agreement between hybrid results and analytical solutions from two cases including the unsteady dynamical and thermal problems. For the condensation process of gas flow, the hybrid transient velocity and temperature fields indicate that the process does not progress smoothly but wavily with noticeable fluctuation, leading to oscillation in temperature field and recirculation flow in velocity field. Analysis based on heat and mass! transfer is carried out in P region, and the Kapitza resistance and the thermal conductivity in liquid are obtained with the satisfying agreement with experimental data, which shows the availability of the developed model for the investigation on the thermal boundary resistance. The good performance had demonstrated that the developed coupling method and computational model are available to provide a multiscale overview in dynamical and thermal problems including phase-transition from nanoscale to microscale, which will show significantly potential in micro fluidics and thermal engineering. |
| Reprint Address: He, YL, Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China. |
| Research Institution addresses: [Sun, Jie; He, Ya-Ling; Tao, Wen-Quan] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China |
| E-mail Address: thisissj@163.com; yalinghe@mail.xjtu.edu.cn |
| Cited References: *NIST, 2005, THERM PROP FLUID SYS. CARSLAW HS, 1986, CONDUCTION HEAT SOLI. CENGEL YA, 2002, THERMODYNAMICS ENG A. CHAN YL, 1985, INT J HEAT MASS TRAN, V28, P603. DELGADOBUSCALIO.R, 2003, PHYS REV E, V119. DELGADOBUSCALIONI R, 2003, J CHEM PHYS, V119, P978, DOI 10.1063/1.1579475. DELGADOBUSCALIONI R, 2005, EUROPHYS LETT, V69, P959, DOI 10.1209/epl/i2004-10431-y. DELGADOBUSCALIONI R, 2006, PHYSICA A, V362, P30, DOI 10.1016/j.physa.2005.09.011. FLEKKOY EG, 2000, EUROPHYS LETT, V52, P271. FLEKKOY EG, 2005, PHYS REV E, V69. HADJICONSTANTINOU NG, 1997, INT J MOD PHYS C, V8, P967. HADJICONSTANTINOU NG, 1999, J COMPUT PHYS, V154, P245. HADJICOSTANTINOU NG, 1999, PHYS REV E B, V59, P2475. JOHNSON JK, 1993, MOL PHYS, V78, P591. KHORDAD R, 2008, PHYSICA A, V387, P4519, DOI 10.1016/j.physa.2008.03.025. LIU J, 2007, J COMPUT PHYS, V227, P279. MARUYAMA S, 1999, THERMAL SCI ENG, V7, P63. MARUYAMA S, 2000, ADV NUMERICAL HEAT T, V2, P189. NAGAYAMA G, 2003, J CHEM PHYS, V118, P1392, DOI 10.1063/1.1528192. NIE XB, 2004, J FLUID MECH, V500, P55, DOI 10.1017/S0022112003007225. NIE XB, 2004, PHYS FLUIDS, V16, P3579, DOI 10.1063/1.1779531. NIE XB, 2006, PHYS REV LETT, V500. OCONNELL ST, 1995, PHYS REV E, V52, P5792. RAPAPORT DC, 2004, ART MOL DYNAMICS SIM. STODDARD SD, 1973, PHYS REV A, V8, P1504. SWARTZ ET, 1989, REV MOD PHYS, V61, P605. THOMPSON PA, 1997, NATURE, V389, P360. VERSTEEG HK, 1995, INTRO COMPUTATIONAL. WAGNER G, 2002, COMPUT PHYS COMMUN, V147, P670. WANG CS, 2007, INT J THERM SCI, V46, P1203, DOI 10.1016/j.ijthermalsci.2007.01.009. WANG YC, 2007, CHEM ENG SCI, V62, P3574. WERDER T, 2005, J COMPUT PHYS, V205, P373, DOI 10.1016/j.jcp.2004.11.019. XU JL, 2007, INT J HEAT MASS TRAN, V50, P2571, DOI 10.1016/j.ijheatmasstransfer.2006.11.031. YEN TH, 2007, MICROFLUID NANOFLUID, V3, P729, DOI 10.1007/s10404-007-0202-3. YI P, 2002, INT J HEAT MASS TRAN, V45, P2087. |
| Cited Reference Count: 35 |
| Times Cited: 0 |
| Publisher: SPRINGER HEIDELBERG; TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY |
| Subject Category: Nanoscience & Nanotechnology; Instruments & Instrumentation; Physics, Fluids & Plasmas |
| ISSN: 1613-4982 |
| DOI: 10.1007/s10404-008-0394-1 |
| IDS Number: 486OD |
| *Record 2 of 2. *Click Here to View Full Record *Order Full Text [ ] |
| Title: The dynamics and rheology of a dilute suspension of hydrodynamically Janus spheres in a linear flow |
| Authors: |
| Author Full Names: Ramachandran, Arun; Khair, Aditya S. |
| Source: JOURNAL OF FLUID MECHANICS 633: 233-269 AUG 25 2009 |
| Language: English |
| Document Type: Article |
| KeyWords Plus: NO-SHEAR CONDITIONS; BOUNDARY-CONDITION; STOKES-FLOW; PARTICLES; SLIP; ANISOTROPY; MOTION; INTERFACES; SURFACES; DESIGN |
| Abstract: The creeping motion of a hydrodynamically 'Janus' spherical particle, whose surface is partitioned into two distinct regions, is investigated. Oil one region, fluid adjacent to the particle obeys the no-slip condition, whereas on the other, fluid slips past the particle. The fore-aft asymmetry of this 'slip-stick' sphere (Swan & Khair, J. Fluid Mech., vol. 606, 2008, p. 115) leads to a number of interesting results when it is placed in different flows, which is illustrated by computing the particle motion to first order in the ratio of slip length to particle radius. For example, in a pure straining field the sphere attains an equilibrium orientation either along the compressional or extensional axis of the flow, depending on the ratio of slip-to-stick surface areas. In a simple shear flow, on the other hand, the slip-stick sphere undergoes a periodic rotational motion, or Jeffrey orbit. Moreover, depending on its initial orientation, the particle can either follow a per! iodic translational orbit or undergo a net displacement along the flow direction. Lastly, to first order in the volume fraction of slip-stick spheres, the suspension rheology is non-Newtonian, with non-zero first and second normal stress differences. |
| Reprint Address: Ramachandran, A, Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA. |
| Research Institution addresses: [Ramachandran, Arun; Khair, Aditya S.] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA |
| E-mail Address: akhair@engineering.uscb.edu |
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| Cited Reference Count: 47 |
| Times Cited: 0 |
| Publisher: CAMBRIDGE UNIV PRESS; 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA |
| Subject Category: Mechanics; Physics, Fluids & Plasmas |
| ISSN: 0022-1120 |
| DOI: 10.1017/S0022112009007472 |
| IDS Number: 489IC |
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