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RISS 인기검색어
- 검색키워드
- 저자 : Abu Al-Rub, Rashid K. (검색결과 3 건)
- 무료
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Thomas, Navya,Sreedhar, Nurshaun,Al-Ketan, Oraib,Rowshan, Reza,Abu Al-Rub, Rashid K.,Arafat, Hassan Elsevier 2018 Desalination Vol.443 No.-
<P><B>Abstract</B></P> <P>3D printing is utilized to create different feed channel spacer designs aimed at enhancing the spacer performance specifically for membrane distillation (MD) application. The novelty is the use of mathematically developed triply periodic minimal surface (TPMS) as feed spacers. Five different TPMS based spacer designs were evaluated and benchmarked against the conventionally used net type spacer. The best performing TPMS spacer topology exhibited 60% higher water flux and 63% higher overall film heat transfer coefficient than the commercial spacer. The TPMS spacer designs also had a significant advantage over the commercial spacer when treating feed with high fouling potential such as brine solution. The advantages of TPMS spacers were the high throughput combined with sustained flux performance over increasing TDS concentrations ranging from 75,000 ppm to 100,000 ppm. The best performing TPMS spacer design was identified to have the highest surface area to volume ratio along with a design structure that caused relatively higher turbulence by disrupting the feed flow. Particle deposition tests were done using microspheres to visualize the impact of TPMS spacer design on dead zone formation. Pearson correlation coefficient showed that particle deposition is strongly correlated to the spacer voidage and its membrane contact area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3D printed TPMS spacers designed for MD application </LI> <LI> TPMS spacers improved flux performance in MD by 60% relative to conventional spacer. </LI> <LI> TPMS spacers enhanced overall film heat transfer coefficient in MD. </LI> <LI> Surface area to volume ratio an important parameter for improved flux performance </LI> <LI> Membrane contact area of TPMS spacers impact the dead zone formation on MD membrane </LI> </UL> </P>
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Sreedhar, Nurshaun,Thomas, Navya,Al-Ketan, Oraib,Rowshan, Reza,Hernandez, Hector H.,Abu Al-Rub, Rashid K.,Arafat, Hassan A. Elsevier 2018 Journal of membrane science Vol.561 No.-
<P><B>Abstract</B></P> <P>An ideal feed spacer balances high flux and low pressure drop while minimizing fouling. In this work, several feed spacer with complex triply periodic minimal surface (TPMS) geometries were designed and fabricated using additive manufacturing (AM) processing. AM technology was employed to vary the voidage and directionality of the spacers. The fabricated spacers were tested to determine their impact on mass transfer, pressure drop and critical flux in a flat-sheet ultrafiltration (UF) setup for protein separation in aqueous medium. Dimensionless numbers analysis was conducted with dextran filtration, while critical flux was determined via the flux-stepping method by filtration of bovine serum albumin (BSA). All the tested TPMS spacers displayed an increase in mass transfer compared to a commercial spacer design, with the Gyroid spacer (84% voidage) exhibiting a 67% increase in Sherwood number. The Gyroid design also showed an 8% improvement in critical flux. Modification of the spacer voidage and direction also showed significant influence on performance. By increasing the voidage of the Gyroid spacer from 84% to 90%, we observe a 97% increase in Sherwood Number and an 18% decrease in Power number, compared to commercial spacer. The findings of this study show the advantages of TPMS architectures as candidates for spacer design in UF.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spacers based on triply periodic minimal surfaces (TPMS) were made. </LI> <LI> Mass transfer study of TPMS spacers in ultrafiltration. </LI> <LI> Modification of directionality and porosity of TPMS spacers evaluated. </LI> <LI> Spacer with gradually changing porosity fabricated and tested. </LI> <LI> Superior critical flux using some TPMS architectures compared to commercial design. </LI> </UL> </P>
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Sun-Myung Kim,Masoud K. Darabi,Dallas N. Little,Rashid K. Abu Al-Rub 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.6
The effect of different configurations of normal contact stresses on the rutting performance of asphalt concrete overlays on a softand stiff Crushed Aggregate Base (CAB) layer is investigated. A three-dimensional (3-D) finite element model of a pavementstructure is generated. The effect of different types of simplified normal contact stresses and a realistic 3-D normal stress on therutting performance is investigated. Since the failure mechanism of asphaltic materials at high temperature is mainly related to theflow of the material, the viscoelastic and viscoplastic constitutive relationships coupled with the hardening-relaxation mechanismsare utilized to represent the behavior of asphalt concrete layer. This constitutive relationship is part of the PANDA (PavementAnalysis using Nonlinear Damage Approach) model developed by the authors and their collaborators. As the result of simulation, themagnitude of the rut depth on the asphalt concrete layer is generally determined to be inversely proportional to the stiffness of theCAB layer, and the rut depth on the asphalt concrete layer under the realistic 3-D normal stress is about 1.5 times greater than the rutdepth under uniformly distributed normal stress.
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