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Paste-like cemented backfilling technology and rheological characteristics analysis based on jigging sands

Journal of Central South University 2017年第1期24卷 155-167页

作者：魏冲王新民张云海张钦礼 School of Resources and Safety Engineering Central South UniversityChangsha 410083China

To make backfilling body meet strength requirement,physical-chemical evaluation and proportioning tests were conducted on several backfilling *** sands,#32.5 cement and fly ash were determined as backfilling aggregate,binding material and modified material,*** optimized proportion of backfilling materials with a solid mass fraction of 78%and cement:fly ash:jigging sands mass ratio of 1:2:14,was suggested to Jiangan Pyrite Mine,*** slurry made by optimized proportion produced obvious shear thinning phenomena,and was confirmed as paste-like *** analyze its rheological characteristics,L-type pipeline test and Haake VT550 rotational viscometer test were *** and casson fluid models were applied to several paste-like slurry samples to simulate flow and stress states;casson fluid model was proved to have better simulation effect on paste-like slurry with shear thinning phenomena;rheological parameters of backfilling slurry made by suggested proportion were *** yield stress,average apparent viscosity and limiting viscosity are 55.35 Pa,1.216 Pa-s and 0.48 Pa-s,*** with Bingham fluid model,casson fluid model has a better simulation effect on paste-like slurry with shear thinning phenomena,through calculating the residual standard deviations.

关键词： paste-like slurry jigging sands shear thinning casson fluid model backfilling system

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Study of Double Diffusivity and Heat Conducting Phenomena under the casson Nanofluid Flowing through a Vertical Peristaltic Tube

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 563-590页

作者： Azad Hussain Naila Farooq Ayesha Saddiqa Ahmad M.Hassan Abdulkafi Mohammed Saeed Department of Mathematics University of GujratGujrat50700Pakistan Faculty of Engineering Future University in EgyptNewCairoEgypt Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia

The current article discusses the peristaltic flow of the casson fluid model with implications for double diffusivity,radiative flux,variable conductivity and *** study offers a thorough understanding of the functioning and illnesses of embryological organs,renal systems,respiratory tracts,etc.,that may be useful to medical professionals and *** main purpose of the study is to evaluate the consequences of double diffusivity on the peristaltic flow of *** implementing the appropriate transformation,the governed differential equations of momentum,temperature,concentration and double diffusivity are worked out *** lowest Reynolds number Re→0 and highest wavelength�→∞are *** ramifications of pertinent parameters on the velocity field,heat,chemical reaction rate and double diffusivity are discussed by plotting the graphs using the bvp4c *** analysis shows that solutal and thermal Grashof numbers enhance the motion of fluid flow over the pumping area of the peristaltic *** activation energy and Lewis number indicate the opposite impact on concentration *** to variations in thermophoresis and the Brownian parameter,the heating process slows during the pumping section and accelerates during the free pumping *** graph of double diffusivity initially goes upward by escalating Dufour and Brownian parameters and then moves down over the right sinusoidal geometry.

关键词： casson fluid model nanofluid double diffusivity chemical reaction peristaltic motion

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