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Characterization of chlorella vulgaris and chlorella protothecoides using multi-pixel photon counters in a 3D focusing optofluidic system
, Article RSC Advances ; Volume 7, Issue 8 , 2017 , Pages 4402-4408 ; 20462069 (ISSN) ; Mikulicz, J. D ; Boysen, M. R ; Hashemi, N ; Kalgren, P ; Nauman, L ; Baetzold, S. J ; Powell, G. G ; He, Q ; Hashemi, N. N ; Sharif University of Technology
Royal Society of Chemistry
2017
Abstract
Analysis of microparticle size and fluorescence intensity can be used to classify microparticles. We designed and fabricated an optofluidic system that characterizes microparticles, including fluorescent microparticles and microalgae. A new type of multi-pixel photon counter (MPPC) was employed to miniaturize the device, lower its power consumption, and make it insensitive to magnetic fields. The system uses a 635 nm laser for excitation of the microparticles' fluorescence. The scattered light from the fluorescent microparticles, as well as Chlorella vulgaris and Chlorella protothecoides, were measured. Additionally, we analyzed the width and height of the measured signals generated as a...
Polymer-Enhanced low-salinity brine to control in situ mixing and salt dispersion in low-salinity waterflooding
, Article Energy and Fuels ; Volume 35, Issue 13 , 2021 , Pages 10540-10550 ; 08870624 (ISSN) ; Rostami, B ; Mahani, H ; Sharif University of Technology
American Chemical Society
2021
Abstract
Although viability of low-salinity waterflooding (LSWF) at the laboratory scale has been proven, there are some challenges associated with its field application, which sheds uncertainties on its economic success. One of the challenges is the minimum required volume of low-salinity water, which should be injected to the reservoir due to the salt dispersion in porous media. Once the low-saline brine is injected into the reservoir, mixing of injected (low-salinity) and resident (high-salinity) brines occurs and the developed mixing zone grows continuously as the front moves from the injection well toward the production well. Increase in the salinity of the front reduces the efficiency of LSWF....
Insight into the behavior of colloidal gas aphron (CGA) fluids at elevated pressures: an experimental study
, Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 537 , January , 2018 , Pages 250-258 ; 09277757 (ISSN) ; Kazemzadeh, E ; Kamari, E ; Ghazanfari, M. H ; Soleymani, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Recently, colloidal gas aphron (CGA) fluids technology has been employed to drill depleted oil and gas reservoirs. Almost all reported experience on CGA fluids were conducted at ambient conditions, and little attention has been paid on the behavior of CGAs at high pressures which is more close to real conditions. In this study, high pressure experiments were conducted by using High Pressure Microscope cell to visualize/monitor the behavior of CGAs at elevated pressures. Single bubble behavior and bubble size distribution (BSD) of CGAs were investigated under different scenarios of pressure change. Results of experiments revealed that BSD of CGAs is controlled by the path of pressure changes,...