PIV Measurement of Fluid Flow Inside a Human Uterus Model for Cryoablation

PIV Measurement of Fluid Flow in Human Uterus Model Dragon, Jim SJ Chen 1, Mara Wolfson 2, Charles Phillips 2, Thomas Schaffer 2 1 Department of Mechanical Engineering, Temple University, 2 Temple University School of Medicine Abstract Frozen human uterus over the inner surface of the uterine endometrium Perfluorinated compounds that allow excision (PFC). To understand the intrauterine PFC flow field during cryoablation a uterine model was established; a fluid delivery system containing a fluid delivery probe was designed and constructed to simulate PFC flow during cryosurgery .

Particle Image Velocimetry (PIV) is an optical method for flow visibility for educational research. It is used to acquire instantaneous velocity measurements in fluid and its associated characteristics. It is assumed that the fluid is inoculated with tracer particles and for sufficiently small particles it is assumed that the flow dynamics faithfully follow (the extent to which the particle faithfully follows the flow is represented by the Stokes number). In order to make the particles visible, a fluid containing entrained particles is irradiated. The movement of seed particles is used to calculate the velocity and direction of the flow investigated (velocity field).

Seed particles are an integral part of the PIV system. Depending on the fluid being studied, the particles must be able to reasonably match the fluid properties. Otherwise, they will not be able to satisfactorily follow the process so that the PIV analysis is considered accurate. Ideal particles have the same density as the fluid system used and become spherical (these particles are called microspheres). Actual particle selection depends on the nature of the fluid, but is usually for macroscopic PIV studies of glass beads, polystyrene, polyethylene, aluminum flakes, or oil droplets (if the fluid being investigated is a gas). The particle size of the seed particles should be different from the fluid to which they are seeded, such that the laser film incident on the fluid flow is reflected from the particles and scattered towards the camera.

Particle Image Velocimetry (PIV) is an experimental tool for fluid dynamics and aerodynamics. The basic principle involves photographic recording of the movement of microparticles following a flow of fluid or gas. The particle motion is then determined from the photographic recording using the image recording method to determine the flow velocity. If there is sufficient particles in the flow area of ​​the study, you can determine the entire velocity field of the flow. A velocity field close to the moment is particularly important. Therefore, PIV has all the advantages of flow visualization method, but it can also provide valuable quantitative information. If you know the velocity field, you can easily obtain data such as vorticity and strain, and if the PIV record is sufficient, the turbulence intensity can be estimated.