Abstract:
The formation of droplets includes a wide range of sciences and researches Due to its expanded application in various industries and tools. The droplets forms the basis of many applications including: the fabrication and combination of new materials, the formulation of products for pharmaceutical use, cosmetics, and food industries. In this study, to produce these particles, a microfluidic device with flow focusing geometry has been used .Furthermore, the influence of some factors such as flow rate ratio, capillary number, and interfacial tension between two emulsions, channel diameter variation and channel angle variation on the physical process of formation and creation of droplets have been investigated.
Abstract:
Gas/liquid segmented flow can dramatically enhance heating/cooling cycles, and found tremendous applications in PCR, quantom dot and nanocrystals fabrication. In this article, pre-determined shear force on liquid cuts gas off an immiscible stream of gas/liquid, generating segmented flow. Droplets are generated in flow confinements engraved on rotational disks, where the confinement angle brings the shear force to a maximum. Meriting a passive, cheap and straightforward design, droplet size is controlled by rotational velocity, allowing compact integrations, with minimum storage or supply units and off-the disk tooling
Abstract:
A turbine spirometer with an IR rotary encoder is designed and fabricated for operating respiratory functional tests (RFT). The system includes a hardware for gathering breathe inhale and exhale
flow rate and a user software which represents analyzed data of patients breathe flow and volume parameters in real-time.
The purpose of the paper is to evaluate the efficiency of three different types of noise reduction filters in term of increasing the accuracy of system in calculation of air volume passing
through the spirometer turbine. Three different types of flow waves are experimented and the most sufficient filter for corresponding respiratory functional tests are reported.Â
Keywords—Spirometer, Respiratory Functional Test, Noise Reduction, IR Encoder
Abstract:
According to the investigation on drug delivery systems, it was figured out one of the most important issue which pharmacists have been faced is lack of ability in high controllable drug carrier. Therefore, droplet production with the aid of microfluidic devices as adaptive devices with the wide range of application has considered. It has significant advantages such as massive production of monodisperse droplets, high surface-area-to-volume ratio that facilitate fast reaction, and independent control of each droplet. In this research, the main aim is to producing droplets as a structure for drug carrier with the aid of microfluidic devices with flow focusing geometry. During this research, the effect of geometrical, mechanical and fluid characteristics on the diameter of the produced droplets has been evaluated. According to the results, with increasing the angle between the main and secondary channels and increasing the width of the channels, the diameter of the droplets expanded exponentially and relatively linearly, respectively. However, by decreasing the viscosity ratio to the surface tension of the fluid, the diameter of the produced droplets decreases relatively linearly. It should be noted that in all studies, when the regime changes, the mutation of the microchip occurs in the changes. In the end, according to observations, an increase in the continuous phase flow rate leads to a reduction in the diameter of the produced droplets.
