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Peristalsis

  Peristaltic pumping a form of fluid transport, is a physiological flow dynamics in the human body that propels the fluids from one place to another. Peristaltic action is an inherent neuromuscular property of any tubular smooth muscle structure. The fluid is driven by a periodic progressive wave of contraction and expansion along the length of the distensible tube of uniform or varying cross-section. It is responsible for the transport of biological fluids in several physiological processes such as passage of urine from the kidneys to the bladder, the movement of chime in the gastro-intestinal tract, transport of food bolus through the esophagus, transport of blood in small devices, embryo transport in non-pregnant uterus, and movement of spermatozoa in human reproductive tract. Flawed or improper peristaltic motion in the ejaculatory duct may lead to retrograde ejaculation (ejaculation in which seminal fluid is discharged in the wrong direction, traveling up towards the bladder instead of outside the body through the urethra) a cause for infertility in men. Retrograde ejaculation is caused by diabetes, bladder neck surgery, alpha-antagonists, transurethral prostatectomy (TURP), colon or rectal surgery, multiple sclerosis, or spinal cord injury.

        The objectives of this research are to compare the flow characteristics of different non - Newtonian fluid models namely power law, Bingham, and Herschel-Buckley models and investigate the effects of different wall motions (sinusoidal, multi-sinusoidal, triangular, trapezoidal and square wave forms) on the fluid flow . We also aim to study the reflux phenomenon.

    Figure 1 shows the instantaneous wall location for different waveforms. Straight lines depict the position of the wall before the start of peristalsis. Figure 2 shows the positive and negative velocity profiles obtained for a sinusoidal wave form. 

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by zopeown last modified 2016-08-04 22:41