The guinea pig ileum responds to distension with characteristic wall movements, luminal pressure gradients, and outflow (the peristaltic reflex). To date, little is known about whether the peristaltic reflex generates flow events other than laminar flow. Here we used a numerical method to solve for the flow generated by moving walls to assess occlusive contractions (case 1), nonocclusive contra...

INTRODUCTION Urine transport from the kidneys into the urinary bladder is one of the classical subjects of applied peristaltic transport theory with which the modeling of ureteral flow practically began [1]. In general, the ureteral flow is not purely peristaltic and includes a component which depends on the pressure difference between the renal pelves and the urinary bladder. Thus reflux might...

The function of the pylorus and the pyloric antrum in the control of gastric emptying has been studied in an isolated rat stomach-duodenum preparation. Pressures in the body and pyloric antrum and flow through the duodenum were recorded using electronic transducers. Vigorous peristalsis and episodic flow were induced by electrical stimulation. The pylorus is normally open until it is transientl...

This paper deals with peristaltic flow of a Johnson–Segalman fluid in an asymmetric channel under long-wavelength and lowReynolds number considerations. The channel asymmetry is caused due to the peristaltic wave train on the walls having different amplitudes and phase. A series solution for small Weissenberg number is obtained for the stream function, axial velocity, axial pressure gradient an...

In the present investigation we have studied the peristaltic flow of a couple stress fluid in a non-uniform rectangular duct. The flow is investigated in a wave frame of reference moving with the velocity c away from the fixed frame. The peristaltic waves propagating on the horizontal side walls of a non-uniform rectangular duct is studied under lubrication approach. The exact solutions of velo...

The capacity of ureteral stents to enhance the conveyance of urine from kidney to bladder is the critical function for patients that require them. The flow path in and around the stent is not a trivial one, particularly if some elements of peristalsis are present in the ureter. This paper details a numerical flow simulation for an axially symmetric stented ureter segment. The flow of urine thro...

Due to the widespread use of peristaltic pumps in the pharmaceutical industries, manufacturers are searching for new type of pumping machines, based on the mathematical models. Researchers have predicted the results of peristaltic transport in many applications mathematically and failed to interpret the results. One of the reasons is the difficulties faced in generation of peristaltic transport...

This study is concerned with the peristaltic motion of a Maxwell fluid in an asymmetric compliant channel. The channel asymmetry is created because of peristaltic wave trains of different amplitudes and phases on the channel walls. Mathematical model of the governing problem is first presented and then important phenomenon of "mean flow reversal" is examined. The variations of the interesting p...

The peristaltic flow of a Jeffrey fluid with variable viscosity through a porous medium in an asymmetric channel is investigated. The channel asymmetric is produced by choosing the peristaltic wave train on thewall of different amplitude and phase. The governing nonlinear partial differential equations for the Jeffrey fluid model are derived in Cartesian coordinates system. Analytic solutions f...