This paper presents the refrigerant adiabatic upward flow in the vertical header of microchannel heat exchanger and its effect on distribution. R410A is circulated into the header through the microchannel tubes (5 or 10 tubes) in the bottom pass and exits through tubes (5 or 10 tubes) in the top pass representing flow in the heat pump mode of reversible systems. Three circular headers were expl...

Microchannels typically have rectangular cross-sections, whereas biological channels, such as blood vessels and airways, circular cross-sections. The difference in cross-sections causes different fluidic behaviors, resulting differences between behavior microchannels channels. To simulate vitro, cross-sectional are required. We developed a microchannel with smooth channel wall, free from cracks...

This Letter presents a reconfigurable optical diffraction grating using multiphase droplets on a microfluidic chip. The uniform and evenly spaced circular droplets are generated by continuously dispersing two immiscible liquids into a T junction to produce plugs, which are then transformed into a circular shape at a sudden expansion of the microchannel. In experiments, the droplet grating shows...

X-ray fluorescence imaging is a widely used, nondestructive method for determining the distribution and relative concentration of metals within a sample. To create a two-dimensional map of an image, x-rays are usually sent through a 25-250 μm wide aperture, then point by point an image is scanned. Microchannel plates contain an array of tiny holes that can be used to collimate x-rays fluorescin...

Microchannels located at the cement–rock interface can form potential pathways for formation fluid leakage in oil and gas wells. The effects of geometric shape, quantity, inclination angle microchannels on flow through cemented rock samples were explored. Finite element 3D models established based modified micro-CT images obtained from physical samples. volume rate different sections was extrac...

AC-driven electrothermal flow is used to enhance the chaotic mixing through vortex flow in micro-fluidic systems by nearly an order of magnitude. Diffusion of heat and momentum can be increased because of the electrothermal force acting on the fluid through the applied AC electric field. Numerical simulation of vortex-assisted mixing in circular microchannel flow is investigated by solving a se...

The motion of the red blood cells (RBCs) flowing in microvessels and microchannels depend on several effects, such as hematocrit (Hct), geometry, and temperature. According to our knowledge, the effect of the temperature on RBC motion was never investigated at a microscale level. Hence, the aim of the present work is to determine the effect of the temperature on the RBC’s trajectories and to in...

This article presents a new integrated microfluidic/microoptic device designed for basic biochemical analysis. The microfluidic network is wet-etched in a Borofloat 33 (Pyrex) glass wafer and sealed by means of a second wafer. Unlike other similar microfluidic systems, elements of the detection system are realized with the help of microfabrication techniques and directly deposited on both sides...