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Uniformity of flow distribution is an application subject in many engineering equipment such as in drug delivery and fuel processing reactors. With a uniform distribution of flow during their operation, better heat transfer, temperature control, and low pressure loss can be achieved. In this work, uniformity of flow distribution was studied in para...
Citations
... Moreover, there is a slight change in φ in the laminar Reynolds range as the inflow rate increases. Some other studies concentrated on finding the optimized configuration of a manifold are in references [10][11][12][13][14][15][16]. The studies above bring to mind the idea in which the analytical solution for finding the optimized configuration of the manifold and the channels is finding the model of changing φ and p as a function of the geometric parameters. ...
In estimating the performance of parallel microchannels, non-uniformity of flow distribution (φ) and pressure drop (p) are critical parameters. These parameters are affected by flow rate, the inlet flow configuration and microchip geometric factors. This paper, in a constant rate, and configuration of fluid entrance into the chip, examines the effect of geometric-channels and manifolds-parameters on φ and p. For this purpose, by employing a set of CFD models modeled in COMSOL, a finite element software, the effect of each geometric factor is examined separately. The results show that increasing the number of channels, the distance between channels, the concavity, and reducing the width of the channel has a positive effect on the distribution of flow between the channels. Moreover, reducing the convexity, increasing the number of channels, increasing the distance between channels, and declining the width of the channels leads to an increase in p. Eventually, a hybrid artificial neural network (MLP-ICA) is trained by means of 245 CFD models to derive the model of changing of φ and p with the geometric parameters. The MLP-ICA predictive model of φ the R 2 of 0.9912 and the MSE of 4.1 × 10-4 demonstrate the higher accuracy of this model than MLP Model with R 2 of 0.9466 MSE of 7.9 × 10-3 .
... In some studies, the comparison between different structures was studied [10][11][12][13][14][15]. Cho et al. [10] investigated the micro-channel heat sinks with non-uniform heat flux conditions. ...
In the design of micro-heat exchangers, the flow and temperature uniformities are essential parameters for achieving better performance. In this work, uniformity of flow and temperature distributions was numerically studied in parallel micro-channels. Carboxymethyl cellulose (CMC) aqueous solution (0.5 wt.%) was used as a cooling (working) fluid. The rheological behavior of this solution is as power-law non-Newtonian fluid. Different manifold structures were used, and the effect of them on the flow and temperature distributions was studied. Results found that rectangular structure has lower values for temperature difference and uniformity parameter than other cases. So, with the rectangular structure of manifold, temperature and flow distributions are more uniform. In the next consideration, the direction of the inlet flow to micro-channels was studied. Three directions (vertical (90°), horizontal (0°) and oblique (45°)) were used. With different directions, various velocity profiles in the micro-channels were shown. As, with horizontal inlet flow, velocity in middle micro-channel is higher than other micro-channels, while, with vertical inlet flow, the first micro-channel has maximum velocity and velocity decreases in next micro-channels. Also, between these three directions, horizontal inlet flow has better uniformity of flow and temperature.
