دانلود رایگان مقاله لاتین شبکه مدلسازی بولتزمن از سایت الزویر
عنوان فارسی مقاله:
شبکه مدلسازی چند مقیاسی بولتزمن جریان دو فازی در دستگاه های سیال میکرو الگودهی شده
عنوان انگلیسی مقاله:
Multiscale lattice Boltzmann modeling of two-phase flow and retention times in micro-patterned fluidic devices
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Microtechnology and process intensification are gaining an increasingly larger role in the engineering design of emerging technologies. A major impetus in introducing microscale-based technologies emerges from fundamental, architectural, economical, and safety/security advantages. As a technical approach a microscale-based engineering design establishes directions for potentially innovative solutions in many aspects of technology design (intensification of mass and heat transfer, intensification of chemical process rates, chemical product distribution and yield, process control, process safety, process scale-up) and applications (organic and inorganic chemical synthesis and processing, unit operations, environmental technologies, energy conversion technologies, renewable energy technologies).Acomprehensive review ofthese topics can be found in Jensen (2001). For more general considerations of microreactors alone we refer to review articles such as Kolb and Hessel (2004), Kiwi-Minsker and Renken (2005) and Hartman and Jensen (2009). Multiphase flows in microscale structures provide additional complexity and opportunity for the engineering design. Novel designs of multiphase systems in chemical reaction processes (Hessel et al., 2005; Günther and Jensen, 2006), phase separations (Lam et al., 2013; Wiesegger et al., 2013), mixers (Zhao et al., 2006), and analytical devices (Huh et al., 2002), are all evidences for the proliferation of microscale-based technologies. Multiphase flows can also be an undesirable side effect occurring during device operation; a scenario that can be a consequence of normal process performance such as boiling in microscale heat exchangers. Often two-phase flow originates through introduction of the unwanted phase into the system from its surroundings, such as leaks of air bubbles entering the system through equipment gaps or with process feed (Gravesen et al., 1993; Jensen et al., 2004; Sparks et al., 2007). An unaccounted second phase may lead to systems’ reduced efficiency, malfunctions and damage. Elimination of undesirable phase in microscale-based devices is often difficult, thus, a large part of research efforts are focused on proper accommodation of unwanted phases and their influence. Doku et al. (2005) provides an outline of different multiphase microreactor designs, whereas Kohnle et al. (2002), Litterst et al. (2004) and Chung et al. (2008) report on microchannel based architectural solutions for improved bubble mobility. Microscale architectures with features such as microposts or pillars partially or fully replacing classic microchannel arrays, represent a relatively unexplored and advantageous design option. Deployment of microposts in microscale-based devices creates flexible technical solutions. The introduction of microposts has the potential for addressing numerous microscale-based processrequirements due to conveniently positioned internal surface areas for catalyst deposition and new opportunities for manipulation of two-phase flow. The benefits of chemical processes with solid catalysts is emphasized in Doku et al. (2005) whereas their application in microscale heat exchangers is experimentally and theoretically investigated in Krishnamurthy and Peles (2008).
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کلمات کلیدی:
Multiscale Lattice Boltzmann Modeling of Phonon Transport in ... www.tandfonline.com/doi/abs/10.1080/10407790903582942 by A Christensen - 2010 - Cited by 46 - Related articles A coupled lattice Boltzmann (LB)–finite-difference (FD) method is used to solve for the heat transport in a two-dimensional domain. The LB method is used to ... Multiscale modeling of two-phase flows in microarchitectures with ... ir.library.oregonstate.edu/xmlui/handle/1957/54887 by A Truszkowska - 2014 - Related articles Dec 3, 2014 - Multiscale modeling of two-phase flows in microarchitectures with ... Shan and Chen Lattice Boltzmann method, validated and applied to three ... [PDF]Pore-to-continuum Multiscale Modeling of Two-phase Flow in Porous ... digitalcommons.lsu.edu/cgi/viewcontent.cgi?article=4789&context=gradschool... Sheng, Qiang, "Pore-to-continuum Multiscale Modeling of Two-phase Flow in Porous ...... Figure 3-8: Velocity distribution comparison between LBM and network ... [PDF]multi-scale modeling of gas-fluidized beds - Princeton University https://www.princeton.edu/cbe/people/faculty/sundaresan/group/.../pdf/110.pdf by MA van der Hoef - Cited by 169 - Related articles The prime di culty of modeling two-phase gas-solid ow is the interphase cou- ... three levels of modeling: the lattice Boltzmann model, the discrete particle model. Measurement and Modeling of Multiscale Flow and Transport Through ... https://books.google.com/books?isbn=0549763791 Narayan Gopinathan Nair - 2008 The two-phase flow simulations were conducted using the immiscible Lattice Boltzmann technique. The single-phase permeability results were similar to ... Multiscale Modeling of Single-Phase Multicomponent Transport in the ... pubs.acs.org/doi/full/10.1021/ef100190c by P Rama - 2010 - Cited by 16 - Related articles May 6, 2010 - The calculated pressure profiles from the two models are cross-validated to verify .... 4.1Single-Phase Multicomponent Lattice Boltzmann Model.
