The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Kazuhiro Mae - One of the best experts on this subject based on the ideXlab platform.

  • Operation of microfluidic liquid slug formation and slug design for kinetics measurement
    Chemical Engineering Science, 2007
    Co-Authors: Kazuo Matsuyama, Wiroon Tanthapanichakoon, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports experimental investigation of mixing performances inside microfluidic liquid slugs using the Villermaux–Dushman reaction. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. The experimental investigation presents operation methods to form microfluidic liquid slugs having the reactant arrangements. Mixing performances of flows with and without internal circulation are compared and mixing rates for the axial and radial arrangements of reactants are also compared. Moreover, for the radial arrangement, mixing performances can be evaluated using a Dimensionless Number irrespective of flow rate and slug length, based on the novel method discussed in our previous paper, which proposes the modified Peclet Number Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates. These results give support to the suggestions by the previous simulation results.

  • Design of mixing in microfluidic liquid slugs based on a new Dimensionless Number for precise reaction and mixing operations
    Chemical Engineering Science, 2006
    Co-Authors: Wiroon Tanthapanichakoon, Kazuo Matsuyama, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports mixing characteristics inside a microfluidic liquid slug using the computational fluid dynamics (CFD) simulations. Each slug is modeled as a single-phase flow domain. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. Miniaturizing the slug size to microscale allows high interactions between the slug internal fluid and the channel wall, leading to a highly effective internal circulation. However, quantitative understanding of mixing characteristics and the influences of operating parameters on mixing rate is crucial for the design of a liquid slug that ensures desired mixing rates. The simulation results provide insights into the influences of operating parameters on slug-based mixing rates. Based on the simulation results, the modified Peclet Number, Pe * = U s d s 2 / lD , is proposed for designing mixing in liquid slugs. A novel method using Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates is discussed. Using this method, both short (ms) and long (min) mixing timescales can be accessed in the same microfluidic device by simply varying the slug velocity.

Xin Gao - One of the best experts on this subject based on the ideXlab platform.

  • predicting microwave induced relative volatility changes in binary mixtures using a novel Dimensionless Number
    Chemical Engineering Science, 2021
    Co-Authors: Zhenyu Zhao, Guanlun Sun, Xinhui Tang, Xin Gao
    Abstract:

    Abstract Microwave (MW) irradiation is known to selectively interact with polar molecules in a homogeneously mixed liquid solution and change their relative volatilities; this phenomenon has been observed experimentally in various binary mixtures. However, the lack of theoretical analysis and quantitative modeling hinders the further development of novel MW-assisted separation techniques. A novel Dimensionless Number ZMW was derived in the present study based on an assumption involving molecular radiators to explore the effect of dielectric and thermodynamic properties of the materials as well as the MW field intensity on the microwave-induced relative volatility change (MIRVC). Moreover, a quantitative correlation was established between MIRVC and ZMW, whose model parameters were determined by fitting experimental data obtained from mixtures under MW irradiation. The correlation was also employed to predict MIRVC in data obtained from previous studies. The error range between the predicted and experimental values was within ±6%, indicating the validity of the proposed quantitative correlation.

  • predicting microwave induced relative volatility change by a novel Dimensionless Number
    Authorea Preprints, 2020
    Co-Authors: Zhenyu Zhao, Guanlun Sun, Xinhui Tang, Xin Gao
    Abstract:

    Microwave (MW) can selectively interact with polar molecules in homogeneous mixture liquid solution and therefore change their relative volatility, which has been previously observed in experimental results for various binary mixtures. However, the lack of theoretical analysis and quantitative modeling hinders the further development of novel MW-assisted separation techniques. Hence, this study derived a novel Dimensionless Number ZMW based on the assumption of molecular irradiation to explore the effect of the dielectric and thermodynamic properties of materials as well as MW field intensity on the microwave-induced relative volatility change (MIRVC). Furthermore, a quantitative correlation between MIRVC and ZMW was established, whose model parameters were determined by fitting experimental data under MW irradiation. The correlation was also utilized to predict MIRVC in the previously published literature and the error range between predictive values and experimental values was within ± 6%, indicating great validity of the proposed quantitative correlation.

F Noori - One of the best experts on this subject based on the ideXlab platform.

  • an analytical solution for boundary layer flow of a nanofluid past a stretching sheet
    International Journal of Thermal Sciences, 2011
    Co-Authors: M Hassani, Mohammad M Tabar, H Nemati, G Domairry, F Noori
    Abstract:

    Abstract In this paper, the problem of boundary layer flow of a nanofluid past a stretching sheet has been investigated analytically by using the Homotopy Analysis Method. Both the effects of Brownian motion and thermophoresis are considered simultaneously. An analytical solution is presented which depends on the Prandtl Number Pr, Lewis Number Le, Brownian motion Number Nb and thermophoresis Number Nt. The results show that the reduced Nusselt Number is a decreasing function of each Dimensionless Number, while the reduced Sherwood Number is an increasing function of higher Pr and a decreasing function of lower Pr Number for each Le, Nb and Nt Numbers like the results presented by Khan and Pop. Contrary the results presented by Khan and Pop, It is found that the reduced Nusselt Number decreases with the increase in Pr for many Nb Numbers. However for a special Nb, there are conversely interesting results that are clearly discussed in this paper.

Kazuo Matsuyama - One of the best experts on this subject based on the ideXlab platform.

  • Operation of microfluidic liquid slug formation and slug design for kinetics measurement
    Chemical Engineering Science, 2007
    Co-Authors: Kazuo Matsuyama, Wiroon Tanthapanichakoon, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports experimental investigation of mixing performances inside microfluidic liquid slugs using the Villermaux–Dushman reaction. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. The experimental investigation presents operation methods to form microfluidic liquid slugs having the reactant arrangements. Mixing performances of flows with and without internal circulation are compared and mixing rates for the axial and radial arrangements of reactants are also compared. Moreover, for the radial arrangement, mixing performances can be evaluated using a Dimensionless Number irrespective of flow rate and slug length, based on the novel method discussed in our previous paper, which proposes the modified Peclet Number Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates. These results give support to the suggestions by the previous simulation results.

  • Design of mixing in microfluidic liquid slugs based on a new Dimensionless Number for precise reaction and mixing operations
    Chemical Engineering Science, 2006
    Co-Authors: Wiroon Tanthapanichakoon, Kazuo Matsuyama, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports mixing characteristics inside a microfluidic liquid slug using the computational fluid dynamics (CFD) simulations. Each slug is modeled as a single-phase flow domain. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. Miniaturizing the slug size to microscale allows high interactions between the slug internal fluid and the channel wall, leading to a highly effective internal circulation. However, quantitative understanding of mixing characteristics and the influences of operating parameters on mixing rate is crucial for the design of a liquid slug that ensures desired mixing rates. The simulation results provide insights into the influences of operating parameters on slug-based mixing rates. Based on the simulation results, the modified Peclet Number, Pe * = U s d s 2 / lD , is proposed for designing mixing in liquid slugs. A novel method using Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates is discussed. Using this method, both short (ms) and long (min) mixing timescales can be accessed in the same microfluidic device by simply varying the slug velocity.

Wiroon Tanthapanichakoon - One of the best experts on this subject based on the ideXlab platform.

  • Operation of microfluidic liquid slug formation and slug design for kinetics measurement
    Chemical Engineering Science, 2007
    Co-Authors: Kazuo Matsuyama, Wiroon Tanthapanichakoon, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports experimental investigation of mixing performances inside microfluidic liquid slugs using the Villermaux–Dushman reaction. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. The experimental investigation presents operation methods to form microfluidic liquid slugs having the reactant arrangements. Mixing performances of flows with and without internal circulation are compared and mixing rates for the axial and radial arrangements of reactants are also compared. Moreover, for the radial arrangement, mixing performances can be evaluated using a Dimensionless Number irrespective of flow rate and slug length, based on the novel method discussed in our previous paper, which proposes the modified Peclet Number Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates. These results give support to the suggestions by the previous simulation results.

  • Design of mixing in microfluidic liquid slugs based on a new Dimensionless Number for precise reaction and mixing operations
    Chemical Engineering Science, 2006
    Co-Authors: Wiroon Tanthapanichakoon, Kazuo Matsuyama, Nobuaki Aoki, Kazuhiro Mae
    Abstract:

    Abstract This paper reports mixing characteristics inside a microfluidic liquid slug using the computational fluid dynamics (CFD) simulations. Each slug is modeled as a single-phase flow domain. Slug-based microfluidics offers rapid mixing by internal circulation and transport with narrow residence time distribution, making it suitable for precise reaction and mixing operations. Miniaturizing the slug size to microscale allows high interactions between the slug internal fluid and the channel wall, leading to a highly effective internal circulation. However, quantitative understanding of mixing characteristics and the influences of operating parameters on mixing rate is crucial for the design of a liquid slug that ensures desired mixing rates. The simulation results provide insights into the influences of operating parameters on slug-based mixing rates. Based on the simulation results, the modified Peclet Number, Pe * = U s d s 2 / lD , is proposed for designing mixing in liquid slugs. A novel method using Pe * to estimate mixing rates and design liquid slugs to obtain desired mixing rates is discussed. Using this method, both short (ms) and long (min) mixing timescales can be accessed in the same microfluidic device by simply varying the slug velocity.