Korea-Australia Rheology Journal最新文献

{"title":"Hall and ion-slip currents’ role in transportation dynamics of ionic Casson hybrid nano-liquid in a microchannel via electroosmosis and peristalsis","authors":"Sanatan Das,&nbsp;Bhola Nath Barman,&nbsp;Rabindra Nath Jana","doi":"10.1007/s13367-021-0029-6","DOIUrl":"10.1007/s13367-021-0029-6","url":null,"abstract":"<div><p>This article intends to conduct an analytical simulation for the electroosmosis modulated peristaltic transport of ionic hybrid nano-liquid with Casson model through a symmetric vertical microchannel occupying a homogeneous porous material in the existence of the dominant magnetic field, Hall, and ion-slip currents. The hybrid nano-liquid is acquired by the suspension of silver and silicon dioxide nanoparticles into pure water. The wall slip and convective heating impacts are imposed. The Casson fluid (CF) model is adopted to mimic the rheological behaviour accounting for hybrid nano-liquid. Darcy’s law is applied to evaluate the impact of a porous medium. The Poisson-Boltzmann equation is engaged to accommodate the electric double layer (EDL) in the microchannel. Assumptions of low Reynolds number (LRN), long wavelength (LWL), and Debye-Hückel linearization (DHL) are undertaken to simplify the normalized constitutive equations. Closed-form solutions for the linearized dimensionless resulting equations are achieved by ND-solve code in Mathematica. For a comprehensive physical investigation of the problem under simulation, several graphs are furnished to evaluate the role of emerging thermal and physical parameters in developing the flow patterns and thermal characteristics. Outcomes envisage that Hall, ion-slip, and electro-osmotic parameters have a marked impact on the velocity of the ionic liquid. A decrement in the EDL thickness corresponds to an augmentation in the axial velocity profile in the locality of the channel walls. An increment in radiation parameter results in a demotion in the temperature profile. The pressure gradient is elevated with higher Hall and ion-slip parameters, thermal Grashof number, and electro-osmotic parameter, whereas it is dropped due to higher estimates of Hartmann number. The trapping phenomena under the flow factors are also outlined in brief. The bolus formation is deeply affected by Hall, ion-slip, and electro-osmotic parameters. Outcomes achieved here are expected to shed light on the design and analysis of electro-osmotic pumps, microchannel devices, water filtration and purification processes, DNA analyzers, nanoscale electro-fluid thruster designs in-space propulsion, and many more.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5165197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology, electrical conductivity, and rheology of latex-based polymer/nanocarbon nanocomposites","authors":"Keon-Soo Jang,&nbsp;Hyo Yeol Yeom,&nbsp;Ju Won Park,&nbsp;Song Hee Lee,&nbsp;Seong Jae Lee","doi":"10.1007/s13367-021-0028-7","DOIUrl":"10.1007/s13367-021-0028-7","url":null,"abstract":"<div><p>Nanocarbon materials are critical ingredients with unique properties in emerging materials. In this study, various carbon nanofillers, such as carbon nanotube (CNT), graphene oxide (GO), reduced GO wrapped by poly(styrene sulfonate) (PSS-RGO), and graphite nanoplatelet (GNP), were utilized to examine the effects of nanofiller types and surface treatments on the electrical and rheological properties of polystyrene (PS) nanocomposites prepared by latex-based process. The PS/CNT nanocomposites exhibited the most enhanced electrical and rheological properties among the composites evaluated. The PS/GO nanocomposites showed improved rheological properties and significantly increased electrical conductivity, despite the decrease in the intrinsic properties of graphene due to the change in hybridization from sp² to sp³ by strong acid treatment. Interestingly, they exhibited higher conductivity than PS/PSS-RGO due to the higher graphene moiety and the thermal reduction of GOs during compression molding. The PS/GNP nanocomposites showed marginal enhancement because GNP is a larger aggregate of graphene layers bonded by van der Waals force. The results of this study on the electrical and rheological properties, surface modification, and size and dispersion of conductive nanofillers in an insulating polymer matrix are beneficial for the development and application of electrically conductive nanocomposites.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-021-0028-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5168221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent developments of regenerative magnetorheological (RMR) damper: A review","authors":"Sakib Muhammad Mohtasim,&nbsp;Rubel Ahammed,&nbsp;Md. Mahfujur Rahman,&nbsp;Md Mahbubur Rashid,&nbsp;Rupal Roy,&nbsp;Mohammad Abdul Aziz","doi":"10.1007/s13367-021-0017-x","DOIUrl":"10.1007/s13367-021-0017-x","url":null,"abstract":"<div><p>Magnetorheological (MR) dampers are becoming popular smart devices with controllable higher damping properties. This paper presents an inclusive review of energy harvesting MR dampers. The classifications of energy harvesting MR dampers, operating principles, structural design, mathematical models, fluid models, experimental investigation, and applications are classified and reviewed. The regenerative MR dampers have self-power capability, and self-sensing capability to control higher performance and it is an important feature of regenerative MR dampers. The review indicates that regenerative MR dampers have enough power generation capacity to power MR dampers and higher damping performances. It has been found that a single-ended monotube regenerative MR (RMR) damper has maximum power generation capabilities than other RMR dampers.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0017-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5032011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"State-of-the-art developments of bypass Magnetorheological (MR) dampers: A review","authors":"Mohammad Abdul Aziz,&nbsp;Saiied M. Aminossadati","doi":"10.1007/s13367-021-0018-9","DOIUrl":"10.1007/s13367-021-0018-9","url":null,"abstract":"<div><p>Magneto-rheological (MR) dampers using MR fluids with controllable rheological properties are mainly utilized in automobiles, structures, electrical transmission lines, medical applications, agricultural engineering, and military equipment. This paper presents a comprehensive review of bypass MR dampers. The principles of operation, design structures, analytical models, experimental analysis, and applications of MR dampers are classified and reviewed. The bypass MR dampers have better MR fluid stability and sedimentation control compared to MR dampers. This is important for maintaining homogeneous magnetic flux distribution throughout the fluid area. The advantageous features of external bypass MR dampers over internal bypass dampers are the higher shear stress, the damping force controllability, and the higher damping force they can generate.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0018-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5032232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review on cellulose nanocrystal-reinforced polymer nanocomposites: Processing, properties, and rheology","authors":"Hyo Jeong Kim,&nbsp;Ji Hun Jeong,&nbsp;Yun Hyeong Choi,&nbsp;Youngho Eom","doi":"10.1007/s13367-021-0015-z","DOIUrl":"10.1007/s13367-021-0015-z","url":null,"abstract":"<div><p>The use of nanocomposites is regarded as a promising strategy to significantly improve the overall performance of polymeric materials using a minimal amount of additives. Recently, environmental pollution issues caused by discarded plastic waste have encouraged manufacturers and researchers to replace petroleum-based non-degradable plastics with biomass-derived degradable plastics. Recent research interest in polymeric nanocomposites has resulted in the development of biodegradable nanocomposites using bio-derived nanofillers. Cellulose nanocrystals (CNCs) are one of the most fascinating and widely investigated reinforcing fillers derived from biomass sources such as plants. Compared with conventional inorganic fillers, including carbon nanotubes and metal nanoparticles, CNCs are the most abundant renewable materials on Earth. They do not result in biodegradability deterioration when incorporated into biodegradable polymers. In addition, CNCs exhibit superior dispersibility and chemical affinity to polymeric matrices, resulting in better reinforcing efficiency. Accordingly, considerable effort has been devoted to achieve the desired processability, rheological behavior, and final performances of CNC-loaded nanocomposites. This review aims to provide an overview of the effects of CNCs on the processing, physical properties, and rheology of various types of polymer nanocomposites.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0015-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5029690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation on hysteresis characteristic of squeeze mode magneto-rheological damper based on non-convex constitutive relation","authors":"Fan Wang,&nbsp;Zi-Xiang Ying,&nbsp;Lin-Xiang Wang","doi":"10.1007/s13367-021-0020-2","DOIUrl":"10.1007/s13367-021-0020-2","url":null,"abstract":"<div><p>Magneto-Rheological (MR) fluid is a controllable material upon the applied magnetic field, and various MR dampers with different structures are designed to take advantage of this unique property. In the current paper, the squeeze mode MR damper is analyzed. The two-dimensional MR fluid squeeze flow in the damper is simulated using the Navier-Stokes’ equations. The shear stress of MR fluid is characterized by a non-convex constitutive relation, which is capable of capturing the solid-like to liquid-like switching. The two-dimensional velocity field and pressure distribution of MR fluid are obtained, from which the damping force of the MR damper is obtained. The unique hysteresis characteristic of the force versus velocity relation of the MR damper is captured. Further, the dependence on the loading rate and the field strength of the hysteresis characteristic is studied in the current paper.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0020-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5035754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Study of Die Design for PVC Foam Extrusion","authors":"Nafiz Ahmed Badhan,&nbsp;See Jo Kim","doi":"10.1007/s13367-021-0019-8","DOIUrl":"10.1007/s13367-021-0019-8","url":null,"abstract":"<div><p>Bubble growth inside the die is one of the critical issues in the PVC foam extrusion process. Burning and clogging might have occurred when bubble growth exceeds the critical size, leading to non-uniform outlet velocity and pressure profile inside the die. Therefore, a design modification for die geometry is necessary. This study aims to suppress the bubble generation by making the pressure inside the die greater than the bubble nucleation pressure and to make the velocity distribution uniform at the die exit. A new concept of adding choker bars inside different dies (namely, T-die, fishtail die, and coat-hanger die) is proposed. Three choker bars consecutively placed one after another inside the dies slit sections were numerically simulated to observe and discuss the effects of the proposed geometric shape on the outlet velocity profile in the non-isothermal generalized Newtonian flow. The results show that the velocity distributions at the exit of the die were nearly uniform in all three dies. Among the dies, the fishtail die shows the best outlet velocity uniformity. The pressure values inside all dies are found to be higher than the nucleation pressure except at the last 0.5 mm near the die outlet. This confirmed that the bubble growth could only begin near the 0.5 mm die outlet region in all dies.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0019-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5454314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Droplet-based microextraction — when to go with the flow?","authors":"Jae Bem You","doi":"10.1007/s13367-021-0016-y","DOIUrl":"10.1007/s13367-021-0016-y","url":null,"abstract":"<div><p>Over the last few decades, droplets have been used for enrichment of target compounds from various types of samples including water, body fluids, soils, and food. Leveraging the high surface area-to-volume ratio, droplets are excellent means of rapidly concentrating the target compounds. The droplet-based microextraction technologies reported so far can be categorized as static and continuous. For a static method, droplets are exposed to a given amount of sample while for a continuous method the sample is continuously fed by a flow and the droplets can either remain static or move with the sample flow. Both the extraction performance and types of analyses that can be used depend on whether the method is static or continuous microextraction. This review classifies various droplet-based microextraction techniques as either a static or continuous method and discusses the advantages and drawbacks of each.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0016-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5032320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of the negative wake on the deformation and breakup of viscoelastic droplets","authors":"Fernando Carril-Naranjo,&nbsp;Baltsar Mena,&nbsp;Didier Samayoa,&nbsp;Antonio Guerrero,&nbsp;Bernardo Figueroa-Espinoza","doi":"10.1007/s13367-021-0022-0","DOIUrl":"10.1007/s13367-021-0022-0","url":null,"abstract":"<div><p>Experiments were performed using visual and PIV techniques in order to study the appearance of a negative wake as well as its influence upon the deformation and breakup of droplets rising in viscoelastic fluids. In this report, Newtonian and viscoelastic drops were injected through different viscoelastic fluids; the deformation of the droplets was then followed and analyzed. In the case of <i>Newtonian</i> drops traveling through a viscoelastic fluid, a tail appears which later breaks into satellite droplets; a negative wake is present on the sides of the tail. The viscoelastic drops also exhibit a tail which is more resistant to rupture and the negative wake appears after the tail; additionally, a bump appears at the tip of the tail which enhances its elongation and determines the onset of breakup.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0022-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5032247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear rheology of circular particle suspensions in a Bingham fluid using numerical simulations","authors":"Jia Chen,&nbsp;Wook Ryol Hwang","doi":"10.1007/s13367-021-0021-1","DOIUrl":"10.1007/s13367-021-0021-1","url":null,"abstract":"<div><p>In this study, we performed direct simulations of particle suspensions in a simple shear flow with a viscoplastic model (Bingham fluid) using a finite-element/fictitious-domain method, as a model system for cuttings transport with a drilling mud in the oil and gas exploration. Bulk rheology and particle interaction were investigated via several example problems including single-particle, two-interacting particle, and many-particle problems for various solid fractions in both Bingham and Newtonian fluids. We report that, at low shear rate, huge reductions occur in both the relative bulk viscosity and angular velocity of particle suspension in a Bingham fluid compared to that in a Newtonian fluid. This indicates that, although particle incorporation increases bulk viscosity in a Bingham fluid, the amount of increase appears much smaller than that with the Newtonian medium, and particle motions were restricted to some extend at a low shear rate with a yield stress fluid. Moreover, the suppression in viscosity increase with particles disappears at a high shear rate, just like Newtonian particle suspension. This phenomenon has been interpreted by the suppressed particle angular rotation in a Bingham fluid. In addition, flow fields with low shear regions, where the viscosity of a Bingham fluid is high and the fluid mobility decreased significantly, on the left and right sides of a particle also confirm this interpretation. The two-interacting particle problem reveals delayed particle interaction with increased time period in particle trajectories (drafting, kissing, tumbling and separation) in a Bingham fluid. Similar behaviors with the suppression in viscosity increase can be also observed in the many-particle problem.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s13367-021-0021-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5035755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}