BACKGROUND Blood-contacting devices have contributed to improving the treatment of patients. However, thrombus formation at the interface between a connector and tube is still a potential source of thrombus-related complications that induce stroke or myocardial infarction. We aimed to develop a non-blood-contacting real-time method for visualizing thrombus formation, and to experimentally inves...

Two-phase flow distribution in evaporators has been shown to be directly affected by the development of the flow between the expansion device and the heat exchanger, namely, the separation characteristics of the two phases. For this reason the development of adiabatic two-phase R134a in an 8.7mm transparent PVC tube directly after an expansion valve was studied. This paper presents a mapping of...

In this paper, the transverse vibration of a triple-walled carbon nanotube (TWCNT) conveying fluid flow is studied based on the strain/inertia gradient theory with van der Waals interaction taken into consideration. The nanotube is modelled using Euler-Bernoulli beam model and the Galerkin’s method is employed to obtain the CNT complex valued Eigen-frequencies. The effects of the fluid flow tho...

In many industrial equipment such as boilers and heat exchangers, the cylindrical tubes are exposed to the gas- liquid two phase flow. For any immersed body in flow field vortex shedding is created with a frequency that may be constant or variable, according to conditions such as flow rates, geometry of body, and etc. The failure will happen in the equipment, when this frequency is close to...

Because of the unequal diameter between pulse tube and heat exchangers at two sides, fluid entering from exchanger easily forms a complex disturbing flow in tube, which causes energy loss affects performance refrigerator. This study proposes numerical model for predicting transfer characteristics refrigerators. Three cases adding conical transitions are studied, results indicate that transition...

Heat exchanger is a universal process equipment, which widely used in chemical industry, oil refining, thermal power and other industries. Shell-and-tube heat exchangers often fail prematurely due to flow-induced vibration. In this paper, aiming at the problem of severe vibration shell-and-tube an enterprise, acceleration sensors are measure shell tube side exchanger. Through analysis measureme...

The focus of this work is the modeling and performance comparison of different models of pulse tube refrigerators, namely, the Orifice Pulse Tube Refrigerator (OPTR) and the Inertancetube Pulse Tube Refrigerator (IPTR) with both in-line as well as coaxial configurations. A detailed analysis of the flow and heat transfer in various components of the above mentioned models under oscillating flow ...