Interaction of Peristaltic Flow with Pulsatile Couple-Stress Fluid

1IntroductionPeristalsisIsnow－wellknowntothephyslologlststobeoneofthem8JormechanismforfluidtransportInmanybiologicalsystems．Inpatlcular，peristaltlcmechanismmaybeInvolvedInswal－lowing恤throughtheesophagus，urinetransPOrtfromkidneytobladderthoughuner．Inaddl－tion，perlstaltlcpumpingoccursInmanypracticalapplicationsInvolvingbio－mechanicalsystems．Thestudyofthemechanismofperistalsis，Inbothmechanicalandphysiologicalsituations，hasre－centlybecometheoNectofs。；ent；f；crese。roh．S；nce…     

Peristaltic transport of a couple stress fluid in a uniform and non-uniform channels

The problem of peristaltic transport of a couple stress fluid in uniform and non-uniform two-dimensional channels has been investigated under zero Reynolds number with long wavelength approximation. Blood is represented by a couple stress fluid (a fluid which its particles size are taken into account, a special case of a non-Newtonian fluid). It is found that the pressure rise decreases as the couple stress fluid parameter gamma increases (i.e., small size fluid particle). So the pressure rise for a couple stress fluid (as a blood model) is greater than that for a Newtonian fluid. Also the pressure rise increases as the amplitude ratio phi increases for different values of gamma. Further, the pressure rise in the case of non-uniform geometry is found to be much smaller than the corresponding value in the case of uniform geometry. Finally, the maximum pressure rise when the mean flow rate over one period of the wave, Q = 0, increases as phi increases and gamma decreases.     

Residual time of sinusoidal metachronal ciliary flow of non-Newtonian fluid through ciliated walls: fertilization and implantation

Biomechanics and Modeling in Mechanobiology - The monitoring of the ciliated walls in the uterine tube has supreme importance in enhancing the sperm to reach the egg (capacitation processes), and...