CO2 bubble behaviors and two-phase flow characteristics in …
Management of the produced carbon dioxide (CO 2) is important to improve the performance of a liquid-feed direct methanol fuel cell (DMFC).This work investigates the CO 2 bubble behaviors and the two-phase flow characteristics, using a single sinusoidal corrugated channel as the anode flow field. The magnitude and gradient of the fluid velocity in this …
pcb design
It shows part of a PCIe card with SATA routing and DDR2 RAM: I highlighted 4 areas that qualify as unusual trace layout (from my perspective). What are those shapes supposed to achieve? How do designers come up …
Investigation of a novel serpentine micromixer based on …
Passive micromixers, due to their relatively high mixing efficiency and simple fabrication, have wide applications in biological, medical, and chemical processes. Serpentine and convergent-divergent micromixers are typical kinds of these micromixers. In the present study, a combination of sinusoidal and serpentine microchannels with two types of …
Performance prediction of PEM fuel cell with wavy serpentine …
Effects of serpentine flow channel having sinusoidal wave at the rib surface on performance of PEMFC having 25 cm 2 active area are investigated at different flow rates, three different amplitudes changing from 0.25 mm to 0.75 mm and three different cell operation temperatures. A proton exchange membrane fuel cell (PEMFC) is modeled for the prediction …
The Aeroic Sine Wave Spar
Photo 2: A sine wave aircraft spar section.(image: James Hammond) How Did the ASWS Happen? Going back a bit I have to admit that the ASWS was born from laziness, or maybe boredom or a bit of both.
Serpentine and Rectilinear Motion Generation in Snake …
The serpentine locomotion is a continuous motion during which its move forward making a sinusoidal wave-like motion. On the other hand during the rectilinear motion, the body of the snake moves from tail to the head in such a way that different parts of the snake body move one by one, sequentially.
A cost-effective serpentine micromixer utilizing ellipse curve
Aside from the zigzag, square-wave and circular serpentine micromixers, Parsa et al. [33] designed a sinusoidal serpentine micromixer with different phase shift. They reported that expansion vortices were generated when the phase shift was 3π/4 and π/2, leading to a mixing performance above 90%.
Investigation of a novel serpentine micromixer based on …
In the present study, a combination of sinusoidal and serpentine microchannels with two types of sinusoidal walls is investigated numerically and experimentally for the Reynolds number ranging ...
Investigation of a novel serpentine micromixer based on …
In base sinusoidal serpentine (Fig. 7a), mixing enhances in the transverse direction when the species enter to serpentine microchannel due to the centrifugal forces. These forces …
Sinusoidal waves 5.00 cm in amplitude are to be …
Sinusoidal waves 5.00 cm in amplitude are to be transmitted along a string having a linear mass density equal to 4.00 × 10 2 kg / m. If the source can deliver a maximum power of 90 W and the string is under a tension of 100 N, then the highest frequency at which the source can operate it, is . take .π2=10A. 62.3 HzB. 30 HzC. 45.3 HzD. 50 Hz
Analysis of Passive Mixing in a Serpentine Microchannel …
A serpentine-shaped microchannel with sinusoidal side walls was designed, and three cases, with amplitude to wavelength (A/l) ratios of 0.1, 0.15, and 0.2 were investigated. Numerical...
DEM-LBM study on the behavior of non-spherical particles in …
Furthermore, different geometric styles such as zigzag channels (see e.g. [2, 4]), sinusoidal channels (see e.g. [2, 10, 50, 51]), ... For our case of the symmetric square wave serpentine channel, there are different correlations for different combinations of shape and volume equivalent diameter, ...
1.2: Sinusoidal Waveforms
The sine wave is the simplest wave that may be created. It represents the motion of a simple vector rotating at a constant speed, such as the vertical displacement of the second hand of a clock. An example is shown in …
Mixing enhancement in a passive micromixer with …
Semantic Scholar extracted view of "Mixing enhancement in a passive micromixer with convergent–divergent sinusoidal microchannels and different ratio of amplitude to wave length" by M. Parsa et al. ... study aims to design a chaotic-advection-based passive micromixer with enhanced mixing efficiency by designing a serpentine-shaped ...
Analysis of Passive Mixing in a Serpentine …
Micromachines 2018, 9, 8 3 of 15 serpentine channel with sinusoidal walls, with Reynolds numbers ranging from 0.1 to 50, were compared. A simple serpentine geometry similar to the square wave ...
On designing a wavy sinusoidal micromixer for efficient …
On designing a wavy sinusoidal micromixer for efficient mixing of viscoelastic fluids harnessing elastic instability and elastic turbulence phenomena ... For instance, the integration of an ultrasonic transducer within a microfluidic device harnesses acoustic waves to enhance mixing (Ahmed et al., 2009; Zhang et al., 2021; Luong et al., 2011 ...
Numerical investigation on the performance
Semantic Scholar extracted view of "Numerical investigation on the performance enhancement of PEMFC with gradient sinusoidal-wave fins in cathode channel" by Zhijie Chen et al. ... Performance enhancement of proton exchange membrane fuel cell by utilizing a blocked regulated tri-serpentine flow field: Comprehensive optimization with variable ...
What is a Crinkle Crankle Walls
This directly describes the wall's sinusoidal, or wave-like, design. In the U.S., they are often referred to as "serpentine walls" due to their resemblance to the sinuous …
Crinkle Crankle: The Serpentine Wall With a Funny …
The walls' unique shape makes them stand apart, both aesthetically and in practicality. The pattern of concave and convex waves, known as a sinusoidal pattern, serves a number of important purposes. During the Middle …
Wave-shaped flow channel design and optimization of …
The geometry of a wave-shaped flow channel of PEMFCs with a grooved GDL is shown in Fig. 1, and the geometric parameters of the model are shown in Table 1.The wave-shaped flow channel is indicated at the top right of Fig. 1.The waveform is illustrated as a sinusoidal shape along the channel direction.
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Investigation of a novel serpentine micromixer based on …
multi-wave, and zigzag microchannel at a wide range of Reynolds number and showed that the square-wave ... of the serpentine-sinusoidal mixer for practical applications. 2 Physical model description The micromixer used in this study is a serpentine …
Experimental evaluation of proton exchange membrane fuel …
The experimental results of sinusoidal flow field with diffuser inlet (SSFID) are compared with sinusoidal serpentine flow field (SSFP) and serpentine flow field (SFF) ... A novel opposite sinusoidal wave flow channel for performance enhancement of proton exchange membrane fuel cell. Energy, 261 (PB) (2022) ...
Crinkle Crankle: The Serpentine Wall With a Funny Name
The pattern of concave and convex waves, known as a sinusoidal pattern, serves a number of important purposes. During the Middle Ages, it was discovered that undulating walls helped fruit trees grow better in cooler climates. The curves created pockets that protected the trees from the wind while also trapping heat from the sun and radiating it ...
Thermo-capillarity of immiscible binary fluids within serpentine …
This study theoretically explores the thermocapillary transport of binary-liquid layers in a wavy microchannel with serpentine wall profiles. Sinusoidal profiles are considered for the microchannel walls' temperature and surface topology. Patterned slip conditions at the walls are also accounted for in the analysis to make the problem more ...
Experimental comparative analysis of an air-breath
Su et al., [6] numerically experimentally studied CO 2 gas behavior in a sinusoidal wave nature serpentine flow field pattern. Study reveals that flow disturbances are more in sinusoidal pattern when compared with straight line pattern. Zhou et al., [28] numerically investigated effect of different flow field pattern variants such as serpentine ...
Research and Optimization of Four Serpentine-Wave …
Keywords : PEMFC, Four serpentine-wave flow field (FSWFF), Sag depth, Wave depth, Channel width, Pressure drop Received : 20 November 2023, Accepted : 10 March 2024 1. Introduction ... employs a sinusoidal waveform as the wave pattern, with the aim of reducing fluid resistance in the flow channel. The objective is to create a more favorable
Numerical simulation of performance improvement of …
Since the flow channel has a significant affection on the performance of the proton exchange membrane fuel cells (PEMFCs), a new four-serpentine wave flow field structure was designed and analyzed by numerical simulation in COMSOL Multiphysics software in this paper. After validating the established mathematical model, the effect on the performance was …
Sinusoidal Waves Explained Simply
A sinusoid is periodic, meaning it repeats at regular intervals. $$ y(t) = y(t + T) $$ For example, at times t 1 and t 1 + T, the sinusoidal wave takes the same value, y(t 1) = y(t 1 + T) = -A. …
Analysis of Passive Mixing in a Serpentine Microchannel with Sinusoidal
Sample mixing is difficult in microfluidic devices because of laminar flow. Micromixers are designed to ensure the optimal use of miniaturized devices. The present study aims to design a chaotic-advection-based passive micromixer with enhanced mixing efficiency. A serpentine-shaped microchannel with sinusoidal side walls was designed, and three cases, with …