Influence of random arrangement of hollow fiber membranes on shell side mass transfer performance: a novel model prediction

Zheng, Jumeng; Xu, Zuhua; Li, Jianmei; Wang, Shuyuan; Xu, Yuan

doi:10.1016/j.memsci.2004.02.016

Cited by 36 publications

(26 citation statements)

References 15 publications

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“…Only the first factor, the effect of random fibre packing, received considerable attention. [Zheng et al, 2004] described the effect of randomness by a generalized free surface model, introducing a probabilistic distribution for the areas of the fictitious annuli circumventing each fibre. [Wu & Chen, 2000] used Voronoi tessellation to generate polygonal regions around each fibre.…”

Section: Discussionmentioning

confidence: 99%

Recovery of Biosynthetic Products Using Membrane Contactors

Gostoli¹

2011

Mass Transfer - Advanced Aspects

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Section: Discussionmentioning

confidence: 99%

Recovery of Biosynthetic Products Using Membrane Contactors

Gostoli¹

2011

Mass Transfer - Advanced Aspects

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“…(10). η(z) is the local performance ratio, defined as the ratio of the vaporization heat associated with the transmembrane flux to the heat transferred across the membrane, and given by…”

Section: Transport Models Of Feed and Permeate Sidesmentioning

confidence: 99%

“…In particular, the hollow fiber membrane module has the highest packing density of all module configurations, while it has a higher pressure drop, due mainly to a high ratio of fiber length to diameter [4]. Nevertheless, much studies have been devoted to hollow fiber membranes due to their high mass transfer rate, resulting from the high surface density area [1,2,4,6,9,10]. Another important factor of the hollow fiber module is the deficiency in fluid flow through the effective mass transfer area due to the flow maldistribution, which is caused by the polydispersity of fiber diameter at the tube side and the non-uniformity of fiber packing at the shell side [9].…”

Section: Introductionmentioning

confidence: 99%

“…Another important factor of the hollow fiber module is the deficiency in fluid flow through the effective mass transfer area due to the flow maldistribution, which is caused by the polydispersity of fiber diameter at the tube side and the non-uniformity of fiber packing at the shell side [9]. It has been shown that the randomness of fiber packing in shell side can result in a permeate flux reduction up to 58% corresponding to a packing density of 40% as compared to the module of uniform packing [9,10]. For MD module with non-isothermal characteristics, therefore, systematic modeling on spatial variations and dependence of the heat and mass transfers on the membrane module configurations, membrane dimensions and operating conditions are important for predicting the process performance and designing the system optimally, but it is rarely studied or even ignored [2].…”

Section: Introductionmentioning

confidence: 99%

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Performance investigation of a solar-assisted direct contact membrane distillation system

Kim

Thu

Ghaffour

et al. 2013

Journal of Membrane Science

167

106

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This paper presents a solar-assisted direct contact membrane distillation (DCMD) system with novel energy recovery concepts for a continuous 24-hour-a-day operation. A temperature modulating scheme is introduced to the solar-thermal system that supplies feed seawater to the DCMD modules. This scheme attenuates extreme temperature fluctuations of the feed water by storing the collected energy during solarpeak hours and reutilizing it throughout the day. Thus, the energy savings is realized yet the feed seawater temperature is maintained within the preferred range. Additionally, the system employs heat recovery from the permeate and brine streams to the feed seawater. The simulations for such a system with a shelland-tube type DCMD modules are carried out to examine the spatial property variations and the sensitivity of system performance (i.e., transmembrane pressure, permeate flux and performance ratio) to the operating conditions (inlet temperature and flow rate) and the fiber dimensions (fiber length and packing density). It is found that there are trade-off between mean permeate flux and performance ratio with respect to permeate inlet temperature and flow rate and between total distillate production and performance ratio with respect to packing density. For the solar-assisted DCMD system having evacuated-tube collectors of 3360 m 2 with 160 m 3 seawater storage tanks and 50 DCMD modules, the annual solar fraction and collector efficiency are found to be 77% and 53%, respectively whilst the overall permeate production capacity is 31 m 3 /day. The overall specific thermal energy consumption of DCMD system with heat recovery is found to be 436 kWh/m 3 and it is about 43% lower as compared to the system without heat recovery. It is observed that the specific thermal energy consumption decreases significantly by 55% with increased collector area from 1983 m 2 to 3360 m 2 whereas the specific electrical energy consumption increases slightly by 16%.

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“…Hence, there are several new correlations developed by other authors that include random packing density [23,26,27].…”

mentioning

confidence: 99%

Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

Yang¹,

Wang²,

Fane³

et al. 2013

Desalination and Water Treatment

119

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Membrane-based separation processes have found numerous applications in various industries over the past decades. However, higher energy consumption, lower productivity and shorter membrane lifespan due to polarization and membrane fouling continue to present severe technical challenges to membrane-based separation. Improved membrane module design and novel hydrodynamics offer strategies to address these challenges.This review focuses on hollow fiber membrane modules which are well-suited to membrane contactor separation processes. Attempts to improve membrane module design should begin with a better understanding of the mass transfer in the hollow fiber module, therefore this review provides a summary of prior studies on the mass transfer models related to both the shell-side and tube-side fluid dynamics. Based on the mass transfer analysis, two types of technique to enhance hollow fiber membrane module performance are discussed: (1) passive enhancement techniques that involve the design and fabrication of effective modules with optimized flow geometry; or (2) active enhancement techniques that uses external energy to induce a high shear regime to suppress the undesirable fouling and concentration polarization phenomena. This review covers the progress over the past five years on the most commonly proposed techniques such as bubbling, vibrations and ultrasound.Both enhancement modes have their advantages and drawbacks. Generally, the passive enhancement techniques offer modest improvement of the system performance, while the active techniques, including bubbling, vibrating and ultrasound, are capable of providing as high as 315 times enhancement of the permeation flux. Fundamentally, the objectives of module design should include the minimization of the cost per amount of mass transferred (energy consumption 3 and module production cost) and the maximization of the system performance through optimizing the flow geometry and operating conditions of the module, scale-up potential and expansion of niche applications. It is expected that this review can provide inspiration for novel module development.

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Influence of random arrangement of hollow fiber membranes on shell side mass transfer performance: a novel model prediction

Cited by 36 publications

References 15 publications

Recovery of Biosynthetic Products Using Membrane Contactors

Recovery of Biosynthetic Products Using Membrane Contactors

Performance investigation of a solar-assisted direct contact membrane distillation system

Membrane module design and dynamic shear-induced techniques to enhance liquid separation by hollow fiber modules: a review

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