caa a22 4500 605479801 CHVBK 20210128100412.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10544-015-9959-4 doi (NATIONALLICENCE)springer-10.1007/s10544-015-9959-4 Microfluidic analysis of pressure drop and flow behavior in hypertensive micro vessels [Elektronische Daten] [Ruiqing Hu, Fen Li, Jiaqi Lv, Ying He, Detang Lu, Takashi Yamada, Naoki Ono] The retinal arterial network is the only source of the highly nutrient-consumptive retina, thus any insult on the arteries can impair the retinal oxygen and nutrient supply and affect its normal function. The aim of this work is to study the influences of vascular structure variation on the flow and pressure characteristics via microfluidic devices. Two sets of micro-channel were designed to mimic the stenosed microvessels and dichotomous branching structure in the retinal arteries. Three working fluids including red blood cell (RBC) suspension were employed to investigate the pressure drop in the stenosed channel. The flow behaviors of RBC suspensions inside the micro channels were observed using high speed camera system. Pressure drop of different working fluids and RBC velocity profiles in the stenosed channel were obtained. Moreover, hematocrit levels of RBC suspensions inside the bifurcated channels were analyzed from the sequential images of RBC flow. The results of the flow in the stenosed channel show that RBCs drift from the center of the channels, and RBC velocity is influenced not only by the inlet flow rate but also the interaction between RBCs. The measured pressure drops in the stenosed channel increase notably with the increase of fluid viscosity. Furthermore, the dimensionless pressure drop due to the stenosis decreases with Reynolds number. On the other hand, the results of flow through the bifurcated channels show that as the ratio of the daughter-branch width to the mother-channel width increases, the ratio of hematocrit in two connected branches (Ht/Hd) decreases, which is in favorable agreement with the available analysis results. Springer Science+Business Media New York, 2015 Microfluidic device nationallicence Pressure drop nationallicence Hematocrit nationallicence RBC velocity nationallicence Fahreaus effect nationallicence Hu Ruiqing Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut Li Fen Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut Lv Jiaqi Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut He Ying School of Energy and Power Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, China aut Lu Detang Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut Yamada Takashi College of Engineering, Shibaura Institute of Technology, 135-8548, Tokyo, Japan aut Ono Naoki College of Engineering, Shibaura Institute of Technology, 135-8548, Tokyo, Japan aut Biomedical Microdevices Springer US; http://www.springer-ny.com 17/3(2015-06-01), 1-9 1387-2176 17:3<1 2015 17 10544 https://doi.org/10.1007/s10544-015-9959-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10544-015-9959-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hu Ruiqing Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut NATIONALLICENCE 700 1- Li Fen Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut NATIONALLICENCE 700 1- Lv Jiaqi Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut NATIONALLICENCE 700 1- He Ying School of Energy and Power Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, China aut NATIONALLICENCE 700 1- Lu Detang Department of Modern Mechanics, University of Science and Technology of China, 230027, Hefei, Anhui, China aut NATIONALLICENCE 700 1- Yamada Takashi College of Engineering, Shibaura Institute of Technology, 135-8548, Tokyo, Japan aut NATIONALLICENCE 700 1- Ono Naoki College of Engineering, Shibaura Institute of Technology, 135-8548, Tokyo, Japan aut NATIONALLICENCE 773 0- Biomedical Microdevices Springer US; http://www.springer-ny.com 17/3(2015-06-01), 1-9 1387-2176 17:3<1 2015 17 10544