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  • 1
    Electronic Resource
    Electronic Resource
    Erosion in the tube entrance region of a shell and tube heat exchanger (2005)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 15 (2005), S. 143-160 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - In oil and gas industries, the presence of sand particles in produced oil and natural gas represents a major concern because of the associated erosive wear occurring in various flow passages. Erosion in the tube entrance region of a typical shell and tube heat exchanger is numerically predicted. Design/methodology/approach - The erosion rates are obtained for different flow rates and particle sizes assuming low particle concentration. The erosion prediction is based on using a mathematical model for simulating the fluid velocity field and another model for simulating the motion of solid particles. The fluid velocity (continuous phase) model is based on the solution of the time-averaged governing equations of 3D turbulent flow while the particle-tracking model is based on the solution of the governing equation of each particle motion taking into consideration the viscous and gravity forces as well as the effect of particle rebound behavior. Findings - The results show that the location and number of eroded tubes depend mainly on the particle size and velocity magnitude at the header inlet. The rate of erosion depends exponentially on the velocity. The particle size shows negligible effect on the erosion rate at high velocity values and the large-size particles show less erosion rates compared to the small-size particles at low values of inlet flow velocities. Originality/value - In oil and gas industries, the presence of sand particles in produced oil and natural gas represents a major concern because of the associated erosive wear occurring in various flow passages. The results indicate that erosion in shell and tube heat exchanger can be minimized through the control of velocity inlet to the header.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530510578429
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of geometry on flow field and oil/water separation in vertical deadlegs (2005)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 15 (2005), S. 348-362 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - Corrosion in deadlegs occurs as a result of water separation due to the very low flow velocity. The present work aims to investigate the effect of geometry on flow field oil/water separation in deadlegs in an attempt for obtaining the conditions for avoiding formation of deadleg. Design/methodology/approach - The investigation is based on the solution of the mass and momentum conservation equations of an oil/water mixture together with the volume fraction equation for the secondary phase. A fluid flow model based on the time-averaged governing equation of 3D turbulent flow has been developed. An algebraic slip mixture model for the calculation of the two immiscible fluids (water and crude oil) is utilized. Findings - Results are obtained for different lengths of the deadleg. The inlet flow velocity is kept unchanged (1.0?m/s) and the deadleg length to diamter ratio (L/DB) ranges from 1 to 7. The considered fluid mixture contains 90 percent oil and 10 percent water (by volume). The results show that the size of the stagnant fluid region increases with the increase of L/DB 1˜3DB. Practical implications - Deadlegs should be avoided whenever possible in design of piping for fluids containing or likely to contain corrosive substance. When deadlegs are unavoidable, the length of the inactive pipe must be as short as possible to avoid stagnant or low-velocity flows. Originality/value - The model solves the continuity and momentum equations for the mixture, and the volume fraction equation for the secondary phase utilizing an algebraic expression for the relative velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530510590605
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  • 3
    Electronic Resource
    Electronic Resource
    Heat transfer to pulsating turbulent flow in an abrupt pipe expansion (2003)
    Bradford : Emerald
    International journal of numerical methods for heat & fluid flow 13 (2003), S. 286-308 
    Details
    ISSN: 0961-5539
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A numerical investigation aimed at understanding the flow and heat transfer characteristics of pulsating turbulent flow in an abrupt pipe expansion was carried out. The flow patterns are classified by four parameters; the Reynolds number, the Prandtl number, the abrupt expansion ratio and the pulsation frequency. The influence of these parameters on the flow was studied in the range 104〈Re〈5×104, 0.7〈Pr〈7.0, 0.2〈d/D〈0.6 and 5〈f〈35. It was found that the influence of pulsation on the mean time-averaged Nusselt number is insignificant (around 10 per cent increase) for fluids having a Prandtl number less than unity. This effect is appreciable (around 30 per cent increase) for fluids having Prandtl number greater than unity. For all pulsation frequencies, the variation in the mean time-averaged Nusselt number, maximum Nusselt number and its location with Reynolds number and diameter ratio exhibit similar characteristics to steady flows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09615530310464517
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The electron overlap potential at metal-solution interfaces
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 68 (1976), S. 367-370 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(76)80129-3
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  • 5
    Electronic Resource
    Electronic Resource
    Ft-Ir spectrometry for the solid/solution interface
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 180 (1984), S. 287-306 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(84)83587-X
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  • 6
    Electronic Resource
    Electronic Resource
    Solvent excess entropy at the electrode-solution interface
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 65 (1975), S. 473-489 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(75)85138-0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Contributions of water dipoles to double layer properties: A three-state water model
    Amsterdam : Elsevier
    Electrochimica Acta 22 (1977), S. 41-46 
    Details
    ISSN: 0013-4686
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(77)85051-2
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The elctrochemical behaviour of hafnium
    Amsterdam : Elsevier
    Electrochimica Acta 27 (1982), S. 129-140 
    Details
    ISSN: 0013-4686
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(82)80071-6
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  • 9
    Electronic Resource
    Electronic Resource
    The electron overlap potential at metal-solution interfaces
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 68 (1976), S. 367-370 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-0728(76)80276-8
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Solvent excess entropy at the electrode-Solution interface
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 65 (1975), S. 473-489 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-0728(75)80144-6
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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