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| *Record 1 of 3. *Click Here to View Full Record *Order Full Text [ ] |
| Title: Dynamic Characterization of Permeabilities and Flows in Microchannels |
| Authors: |
| Author Full Names: Castro, M.; Bravo-Gutierrez, M. E.; Hernandez-Machado, A.; Corvera Poire, E. |
| Source: PHYSICAL REVIEW LETTERS 101 (22): Art. No. 224501 NOV 28 2008 |
| Language: English |
| Document Type: Article |
| Keywords Plus: COMPLEX FLUIDS; LIQUID FLOW; SLIP; MICROFLUIDICS; NANOLITER; PHYSICS |
| Abstract: We make an analytical study of the nonsteady flow of Newtonian fluids in microchannels. We consider the slip boundary condition at the solid walls with Navier hypothesis and calculate the dynamic permeability, which gives the system's response to dynamic pressure gradients. We find a scaling relation in the absence of slip that is broken in its presence. We discuss how this might be useful to experimentally determine-by means of microparticle image velocimetry technology-whether slip exists or not in a system, the value of the slip length, and the validity of Navier hypothesis in dynamic situations. |
| Reprint Address: Poire, EC, Univ Nacl Autonoma Mexico, Fac Quim, Dept Fis & Quim Teor, Mexico City 04510, DF, Mexico. |
| Research Institution addresses: [Bravo-Gutierrez, M. E.; Corvera Poire, E.] Univ Nacl Autonoma Mexico, Fac Quim, Dept Fis & Quim Teor, Mexico City 04510, DF, Mexico; [Castro, M.] Univ Pontificia Comillas, Escuela Tecn Super Ingn ICAI, GISC, E-28015 Madrid, Spain; [Castro, M.] Univ Pontificia Comillas, Escuela Tecn Super Ingn ICAI, Grp Dinam No Lineal DNL, E-28015 Madrid, Spain; [Hernandez-Machado, A.] Univ Barcelona, Fac Fis, Dept Estructura & Constituents Mat, E-08028 Barcelona, Spain |
| E-mail Address: eugenia.corvera@gmail.com |
| Cited References: CHOI CH, 2003, PHYS FLUIDS, V15, P2897, DOI 10.1063/1.1605425. COLLEPARDOGUEVARA R, 2007, PHYS REV E 2, V76, ARTN 026301. COTTINBIZONNE C, 2003, NAT MATER, V2, P238. CRAIG VSJ, 2001, PHYS REV LETT, V87, ARTN 054504. DEGENNES PG, 2002, LANGMUIR, V18, P3413. DEHARO MLJ, 1998, PHYS REV E, V58, P6323. DEVASENATHIPATHY S, 2003, EXP FLUIDS, V34, P504, DOI 10.1007/S00348-003-0588-y. GRANICK S, 2003, NAT MATER, V2, P221. JOSEPH P, 2005, PHYS REV E 2, V71, ARTN 035303. KOPLIK J, 2006, PHYS REV LETT, V96, ARTN 044505. LAUGA E, 2003, J FLUID MECH, V489, P55, DOI 10.1017/S0022112003004695. LAUGA E, 2004, PHYS REV E 2, V70, ARTN 026311. LAUGA E, 2007, HDB EXPT FLUID DYNAM, CH19. MEINHART CD, 1999, EXP FLUIDS, V27, P414. NETO C, 2005, REP PROG PHYS, V68, P2859, DOI 10.1088/0034-4885/68/12/R05. ODDY MH, 2004, J COLLOID INTERF SCI, V269, P192, DOI 10.1016/S0021-9797(03)00601-5. OTTINO JM, 2004, SCIENCE, V305, P485. POIRE EC, 2004, J PHYS-CONDENS MAT, V16, S2055, DOI 10.1088/0953-8984/16/22/003. SANTIAGO JG, COMMUNICATION. SANTIAGO JG, 1998, EXP FLUIDS, V25, P316. SCHOWALTER WR, 1988, J NON-NEWTON FLUID, V29, P25. SQUIRES TM, 2005, REV MOD PHYS, V77, P977. TABELING P, 2006, INTRO MICROFLUIDICS. THOMPSON PA, 1997, NATURE, V389, P360. TRETHEWAY DC, 2002, PHYS FLUIDS, V14, L9. WESTIN KJA, 2003, EXP FLUIDS, V34, P635, DOI 10.1007/s00348-003-0610-4. WHITESIDES GM, 2006, NATURE, V442, P368, DOI 10.1038/nature05058. ZHU YX, 2001, PHYS REV LETT, V87, ARTN 096104. |
| Cited Reference Count: 28 |
| Times Cited: 0 |
| Publisher: AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA |
| Subject Category: Physics, Multidisciplinary |
| ISSN: 0031-9007 |
| DOI: 10.1103/PhysRevLett.101.224501 |
| IDS Number: 376WT |
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| Title: Interfacial Structure in Thin Water Layers Formed by Forced Dewetting on Self-Assembled Monolayers of omega-Terminated Alkanethiols on Ag |
| Authors: |
| Author Full Names: Tiani, Domenic J.; Yoo, Heemin; Mudalige, Anorna; Pemberton, Jeanne E. |
| Source: LANGMUIR 24 (23): 13483-13489 DEC 2 2008 |
| Language: English |
| Document Type: Review |
| Keywords Plus: SUM-FREQUENCY SPECTROSCOPY; CONTACT-ANGLE HYSTERESIS; LOW-ENERGY SURFACE; STICK-SLIP MOTION; LIQUID-FILMS; SOLID-SURFACES; EVAPORATING DROPLETS; D2O ICE; MOLECULAR-DYNAMICS; CONFINED LIQUIDS |
| Abstract: A method for the spectroscopic characterization of interfacial fluid molecular structure near solid substrates is reported. The thickness and interfacial molecular structure of residual ultrathin D2O films remaining after forced dewetting on alkanethiolate self-assembled monolayers (SAMs) of 11-mercaptoundecanoic acid (11-MUA), 11-mercaptoundecanol (I I-MUD), and undecanethiol (UDT) on Ag are investigated using ellipsometry and surface Raman spectroscopy. The residual film thickness left after withdrawal is greater on hydrophilic SAMs than on hydrophobic SAMs. This behavior is rationalized on the basis of differing degrees of fluid slip within the interfacial region due to different interfacial molecular structure. The v(O-D) regions of surface Raman spectra clearly indicate unique interfacial molecular properties within these films that differ from bulk D2O. Although the residual films are created by shear forces and Marangoni flow at the three-phase line during the forced ! dewetting process, the nature of the films sampled optically must also be considered from the standpoint of thin film stability after dewetting. Thus, the resulting D2O films exist in vastly different morphologies depending on the nature of the water-SAM interactions. Residual D2O is proposed to exist as small nanodroplets on UDT surfaces due to spontaneous rupture of the film after dewetting. In contrast, on 11-MUD and 11-MUA surfaces, these films exist in a metastable state that retains their conformal nature on the underlying modified surface. Analysis of the peak intensity ratios of the so-called "ice-like" to "liquid-like" v(O-D) modes suggests more ice-like D2O character near 11-MUD surfaces, but more liquid-like character near 11-MUA and UDT surfaces. The creation of residual ultrathin films by forced dewetting is thus demonstrated to be a powerful method for characterizing interfacial molecular structure of fluids near a solid substrate under amb! ient conditions of temperature and pressure. |
| Reprint Address: Pemberton, JE, Univ Arizona, Dept Chem, 1306 E Univ Blvd, Tucson, AZ 85721 USA. |
| Research Institution addresses: [Tiani, Domenic J.; Yoo, Heemin; Mudalige, Anorna; Pemberton, Jeanne E.] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA |
| E-mail Address: pembertn@u.arizona.edu |
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| Cited Reference Count: 103 |
| Times Cited: 0 |
| Publisher: AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA |
| Subject Category: Chemistry, Physical |
| ISSN: 0743-7463 |
| DOI: 10.1021/la802557x |
| IDS Number: 376XO |
| *Record 3 of 3. *Click Here to View Full Record *Order Full Text [ ] |
| Title: Performance of hydrodynamic lubrication journal bearing with a slippage surface |
| Authors: |
| Author Full Names: Wu, Chengwei |
| Source: INDUSTRIAL LUBRICATION AND TRIBOLOGY 60 (6): 293-298 2008 |
| Language: English |
| Document Type: Article |
| Author Keywords: Bearings; Fluid mechanics; Friction |
| Keywords Plus: WALL SLIP; HYDROPHOBIC SURFACES; LIQUID; FLOW; FILM |
| Abstract: Purpose - The aim of this paper is to propose a design idea for an infinite journal bearing with the optimized slip zone on the bearing sleeve surface. Design/methodology/approach - The approach is to use finite element analysis and the quadratic programming algorithm to study the performance of the journal bearing with a slip zone on the sleeve surface. The fluid film pressure and slip velocity can be obtained in one solution step. Findings - A journal bearing with a slip zone on the sleeve surface produces many different advantages over the traditional journal bearing. Even in a parallel sliding gap there is still a considerable large load support, but a very low friction drag. The effect of the enhancement of such a slip wedge on the journal bearing performance is much greater at a small eccentricity ratio than at a large eccentricity ratio. Numerical analyses indicate that the location and size of the slip zone greatly affect the journal performance. When the eccentricity ratio epsilon = 0.8, the maximum load support is increased by similar to 19 per cent and surface friction coefficients reduced by similar to 35 per cent and similar to 42 per cent at shaft and sleeve surfaces, respectively. Originality/value - The paper shows how the present concept can be used to design not only a journal bearing but also a thrust bearing with a slip wedge. |
| Reprint Address: Wu, CW, Dalian Univ Technol, Dalian, Peoples R China. |
| Research Institution addresses: Dalian Univ Technol, Dalian, Peoples R China |
| E-mail Address: cwwu@dlut.edu.cn |
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| Cited Reference Count: 26 |
| Times Cited: 0 |
| Publisher: EMERALD GROUP PUBLISHING LIMITED; HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND |
| Subject Category: Engineering, Mechanical |
| ISSN: 0036-8792 |
| DOI: 10.1108/00368790810902232 |
| IDS Number: 377VI |
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