@article{hassan_anantharamaiah_khan_pourdeyhimi_2016, title={Computational Fluid Dynamics Simulations and Experiments of Meltblown Fibrous Media: New Die Designs to Enhance Fiber Attenuation and Filtration Quality}, volume={55}, ISSN={["0888-5885"]}, DOI={10.1021/acs.iecr.5b04020}, abstractNote={The meltblowing process employs high-speed hot air jets to attenuate polymer streams injected from a die head. In this study, we examine design strategies to control the air flow field below the polymer injection point to achieve higher fiber attenuation and meltblown webs with smaller fiber diameters. Computational fluid dynamics (CFD) simulations for new die configurations show that vertical or inclined air constrictors around the primary air jets keep the centerline air velocity and temperature at their maximum values for 10–15 mm longer below the die face than the reference die. Polymer streams are kept near their melting temperatures at higher air velocities for a longer period, resulting in higher fiber attenuation. The underlying mechanisms leading to such behavior are discussed. Experimental results show reduction in fiber diameter and pore size, validating the simulation. Improved filtration properties are also obtained from the nonwovens webs.}, number={7}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Hassan, Mohammad Abouelreesh and Anantharamaiah, Nagendra and Khan, Saad A. and Pourdeyhimi, B.}, year={2016}, month={Feb}, pages={2049–2058} }
 @article{dasdemir_maze_anantharamaiah_pourdeyhimi_2012, title={Influence of polymer type, composition, and interface on the structural and mechanical properties of core/sheath type bicomponent nonwoven fibers}, volume={47}, ISSN={["0022-2461"]}, DOI={10.1007/s10853-012-6499-7}, number={16}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Dasdemir, Mehmet and Maze, Benoit and Anantharamaiah, Nagendra and Pourdeyhimi, Behnam}, year={2012}, month={Aug}, pages={5955–5969} }
 @article{venu_shim_anantharamaiah_pourdeyhimi_2012, title={Three-Dimensional Structural Characterization of Nonwoven Fabrics}, volume={18}, ISSN={["1435-8115"]}, DOI={10.1017/s143192761201375x}, abstractNote={Abstract}, number={6}, journal={MICROSCOPY AND MICROANALYSIS}, publisher={Cambridge University Press (CUP)}, author={Venu, Lalith B. Suragani and Shim, Eunkyoung and Anantharamaiah, Nagendra and Pourdeyhimi, Behnam}, year={2012}, month={Dec}, pages={1368–1379} }
 @article{wong_haslauer_anantharamaiah_pourdeyhimi_batchelor_griffis_2010, title={Focused Ion Beam Characterization of Bicomponent Polymer Fibers}, volume={16}, ISSN={["1431-9276"]}, DOI={10.1017/s1431927610000115}, abstractNote={Abstract}, number={3}, journal={MICROSCOPY AND MICROANALYSIS}, author={Wong, K. C. and Haslauer, C. M. and Anantharamaiah, N. and Pourdeyhimi, B. and Batchelor, A. D. and Griffis, D. P.}, year={2010}, month={Jun}, pages={282–290} }
 @article{anantharamaiah_verenich_pourdeyhimi_2009, title={Durable nonwoven fabrics via fracturing bicomponent Islands-in-the-Sea filaments}, volume={9}, number={2}, journal={AATCC Review}, author={Anantharamaiah, N. and Verenich, S. and Pourdeyhimi, B.}, year={2009}, pages={41–47} }
 @article{durany_anantharamaiah_pourdeyhimi_2009, title={High surface area nonwovens via fibrillating spunbonded nonwovens comprising Islands-in-the-Sea bicomponent filaments: structure-process-property relationships}, volume={44}, ISSN={["1573-4803"]}, DOI={10.1007/s10853-009-3841-9}, number={21}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Durany, A. and Anantharamaiah, N. and Pourdeyhimi, B.}, year={2009}, month={Nov}, pages={5926–5934} }
 @article{anantharamaiah_verenich_pourdeyhimi_2008, title={Durable nonwoven fabrics via fracturing bicomponent islands-in-the-sea filaments}, volume={3}, number={3}, journal={Journal of Engineered Fibers and Fabrics}, author={Anantharamaiah, N. and Verenich, S. and Pourdeyhimi, B.}, year={2008}, pages={1–9} }
 @article{anantharamaiah_roempert_tafreshi_pourdeyhimi_2007, title={A novel nozzle design for producing hydroentangled nonwoven materials with minimum jet-mark defects}, volume={42}, ISSN={["1573-4803"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34547326805&partnerID=MN8TOARS}, DOI={10.1007/s10853-006-1164-7}, number={15}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Anantharamaiah, Nagendra and Roempert, Katharina and Tafreshi, Hooman Vahedi and Pourdeyhimi, Behnam}, year={2007}, month={Aug}, pages={6161–6170} }
 @article{anantharamaiah_tafreshi_pourdeyhimi_2007, title={A simple expression for predicting the inlet roundness of micro-nozzles}, volume={17}, ISSN={["1361-6439"]}, DOI={10.1088/0960-1317/17/5/N01}, abstractNote={The inlet roundness of micro-nozzles can directly influence properties of the liquid jets conducted through them. Obtaining accurate information regarding the inlet roundness of such tiny nozzles, however, is not easy. This is mainly due to the minute dimensions of these nozzles which render most nondestructive examination methods ineffective. In this study, a series of steady-state two-phase computational fluid dynamics simulations is performed to predict the inlet roundness of micro-nozzles used for producing constricted waterjets, i.e., waterjets resulting from a detached nozzle flow. Different micro-nozzles with inlet roundness ranging from r/d = 0 to 0.18 (where r and d are the inlet radius of curvature and the capillary diameter, respectively) were considered to obtain an expression for predicting the nozzle's inlet roundness as a function of its discharge coefficient. It is demonstrated that the discharge coefficient of nozzles conducting a detached flow increases with increasing inlet roundness. The inlet roundness predicted by our expression is in good agreement with the actual roundness determined by sectioning the nozzle and imaging its cross-section. Our expression is believed to be useful for manufacturers and users of capillary micro-nozzles for producing liquid micro-jets.}, number={5}, journal={JOURNAL OF MICROMECHANICS AND MICROENGINEERING}, author={Anantharamaiah, N. and Tafreshi, H. Vahedi and Pourdeyhimi, B.}, year={2007}, month={May}, pages={N31–N39} }
 @article{anantharamaiah_rompert_vahedi tafreshi_pourdeyhimi_2007, title={A study on the role of hydroentangling waterjets in reorienting fibers in nonwoven fabrics}, volume={42}, journal={Journal of Materials Science}, author={Anantharamaiah, N. and Rompert, K. and Vahedi Tafreshi, H. and Pourdeyhimi, B.}, year={2007}, pages={6161–6170} }
 @article{anantharamaiah_tafreshi_pourdeyhimi_2006, title={A study on flow through hydroentangling nozzles and their degradation}, volume={61}, ISSN={["1873-4405"]}, DOI={10.1016/j.ces.2006.01.038}, abstractNote={Abstract Hydroentangling is a technique for mechanically bonding loose filaments or fibers arranged in a web. The efficiency with which the web is entangled depends on the peculiar properties of laminar high-speed waterjets used. The characteristics of such waterjets strongly depend on the operating pressure and the nozzle inlet sharpness which influence the dynamics of fluid flow. In this study, we report on experiments and CFD simulations aimed at improving our knowledge of such two-phase flows. In particular, we simulate the formation and growth of the cavitation cloud inside a sharp-edge hydroentangling nozzle at pressures ranging from 10 to 200 bars ( 5700 Re 25 600 ) . Our experimental results run at the same pressures, confirm that nozzle cavitation will cause “hydraulic flip”. Once hydraulic flip occurs, atomizing waterjets will turn into constricted laminar waterjets with long intact lengths—a necessary condition for hydroentangling. It has been observed that the nozzle inlet deteriorates under high pressures. Our CFD simulations show a striking similarity between the contours of shear stress at the nozzle inlet and the nozzle wear pattern. These findings together with the SEM elemental analysis at the nozzle inlet reveal the potential for metal oxidation around the inlet, implicating stress-induced corrosion as a major contributor to the nozzle wear. Cavitation might also be one of the mechanisms responsible for the above-mentioned wear at the inlet edge. Additionally, our water-borne solid particle tracking, confirms SEM experimental results that particle deposition can potentially play a considerable role in the deterioration of the nozzle inlet shape.}, number={14}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Anantharamaiah, N. and Tafreshi, H. Vahedi and Pourdeyhimi, B.}, year={2006}, month={Jul}, pages={4582–4594} }
 @article{anantharamaiah_tafreshi_pourdeyhimi_2006, title={A study on hydroentangling waterjets and their impact forces}, volume={41}, ISSN={["1432-1114"]}, DOI={10.1007/s00348-006-0162-5}, number={1}, journal={EXPERIMENTS IN FLUIDS}, author={Anantharamaiah, N. and Tafreshi, H. Vahedi and Pourdeyhimi, B.}, year={2006}, month={Jul}, pages={103–113} }
 @article{anantharamaiah_tafreshi_pourdeyhimi_2006, title={Numerical simulation of the formation of constricted waterjets in hydroentangling nozzles - Effects of nozzle geometry}, volume={84}, ISSN={["1744-3563"]}, DOI={10.1205/cherd.05077}, abstractNote={The role of nozzle geometry on the formation of constricted waterjets, waterjets that are detached from the wall throughout the nozzle, is considered in this paper. Such waterjets have found applications in various industries, including nonwoven processing. Due to the very small time and length scales involved in high-speed flow through micronozzles, experimental observation of the jet formation is cumbersome if not impossible. Computer simulation, on the other hand, can improve our understanding of the waterjet formation process under such conditions. In this paper, we report on flow simulations of water through sharp-edge cone-capillary nozzles having a diameter of 128 mm at different Reynolds numbers. Unsteady-state laminar two-phase flow is considered in axisymmetric nozzles with different capillary lengths. Our simulations show the separation of the flow from the nozzle wall as it enters the orifice. Simulations have also revealed that flow reattachment occurs in cases where the nozzle capillary length is longer than a critical length. For sharpedge nozzles operating at high Reynolds numbers, the critical capillary length is found to be about 70% of the nozzle diameter. Nozzles with a capillary length less than the above critical length produce a constricted waterjet with no apparent cavitation during the jet formation.}, number={A3}, journal={CHEMICAL ENGINEERING RESEARCH & DESIGN}, author={Anantharamaiah, N. and Tafreshi, H. Vahedi and Pourdeyhimi, B.}, year={2006}, month={Mar}, pages={231–238} }
 @article{qiu_anantharamaiah_xie_vaidya_zhang_2001, title={Atmospheric pressure helium plasma treatment of ultra high-modulus polyethylene fibers}, volume={10}, number={3}, journal={Advanced Composites Letters}, author={Qiu, Y. and Anantharamaiah, N. and Xie, S. and Vaidya, N. P. and Zhang, C.}, year={2001}, pages={135–139} }