Qiang Guo- Doctor of Engineering
- Professor (Associate) at Institute of Process Engineering, Chinese Academy of Sciences
Qiang Guo
- Doctor of Engineering
- Professor (Associate) at Institute of Process Engineering, Chinese Academy of Sciences
Looking for collaborators on multiphase granular flows...
About
33
Publications
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Introduction
I received B.Eng. degree from Yunnan University in 2014 and Ph.D. degree from Dalian Institute of Chemical Physics, CAS in 2019. I did postdoctoral training at Columbia University and National University of Singapore. I became an associate professor at the Institute of Process Engineering, CAS from March 2024. My research focuses on process intensification of multiphase granular flows related to clean energy based on characterization and regularization of meso-scale structures.
Current institution
Additional affiliations
March 2024 - present
Institute of Process Engineering Chinese Academy of Sciences
Position
- Associate Professor
Publications
Publications (33)
Vibrated gas-fluidized beds are widely used industrially, and two main methods exist to simulate them computationally: (i) in a moving reference frame by oscillating gravity and (ii) in a stationary reference frame by moving the distributor. Further, it is unclear whether gas flow in the plenum chamber of a vibrated fluidized bed should be modeled...
Mixing and segregation of granular particles on the basis of size and density from vertical vibration or upward gas flow is critical to a wide range of industrial, agricultural and natural processes.
As one of the most successful modifications to conventional fluidized beds to intensify their operations, vibrated gas-fluidized beds (VGFBs) have been used extensively in industry. Here, we review the hydrodynamics within VGFBs and their applications to improve fluidization quality of particles that are difficult to fluidize based on gas flow alon...
Granular materials are critical to many natural and industrial processes, yet the chaotic flow behavior makes granular dynamics difficult to understand, model, and control, causing difficulties for natural disaster mitigation as well as scale-up and optimization of industrial devices. Hydrodynamic instabilities in externally excited grains often re...
Bubbling fluidized beds are often used to achieve a uniform particle temperature distribution in industrial processes involving gas and particles. However, the chaotic bubble dynamics pose significant challenges in scale‐up. Recent work (Guo et al., 2021, PNAS 118, e2108647118) has shown that using vibration can structure the bubbling pattern to a...
An accurate drag correlation accounting for multiscale heterogeneous porous structures is a prerequisite for reliable CFD simulation of fluidized beds. Though particle clusters in fluidized beds are usually modeled as porous particles, particle-resolved direct numerical simulation (PR-DNS), in which monodisperse arrays of spheres are taken as model...
Granular particles subject to both vertical gas flow and vertical vibration are shown experimentally to exhibit structured convection cells in a densely packed yet fluidized state without gas voids traveling through the particles. Continuum gas-granular simulations reproduce the phenomenon and demonstrate that the convection occurs due to buoyant f...
Predicting granular flow using continuum approaches is fundamental to advance granular physics and industrial applications. Previous studies have demonstrated that continuum modeling can capture some hydrodynamic instability analogs in monodisperse granular materials. Recently, a family of gravitational instabilities was found between two types of...
Bubble dynamics in gas fluidized beds are mathematically chaotic and difficult to predict. Various ways have been proposed in the past to alter the overall bubble dynamics to improve particular processes. In particular, it has been shown that pulsed gas flow and vibration can be used to transform the chaotic motion of gas bubbles into a dynamically...
A comparative study of flow characteristics in three-dimensional supercritical water fluidized beds (SCWFB, 440-560 ℃, 22-26 MPa), cold gas-solid fluidized beds (CGSFB, 20 ℃, 0.1 MPa), and high-pressure and high-temperature gas-solid fluidized beds (HGSFB, 440-560 ℃, 22-26 MPa) was conducted via two-fluid model simulations across different fluid ve...
The mechanisms underlying homogeneous fluidization of Geldart A particles have long been debated. Recent experiments shed fresh insights that both a solid‐like and a fluid‐like state exist. Herein, 3D computational fluid dynamics‐discrete element method simulations with the incorporation of interparticle van der Waals forces were performed for five...
Significance
The motion of granular materials, e.g., sand or catalytic particles, underlies many natural and industrial processes. Granular dynamics are difficult to understand and model because of transitions between solid-, liquid-, and gas-like behavior, and prior continuum models have struggled to capture these transitions. Bubble-like voids no...
Predictions for bubble and particle dynamics surrounding a single bubble injected into an incipiently cylindrical fluidized bed from CFD-DEM and TFM simulations using different drag laws were compared with prior MRI results. This comparison allows for quantitative assessment of the accuracy of simulations for deterministic behavior of a single bubb...
Fine particles from residual slurry and the mobilized clay particles from the shale formation will invade into the proppant-supported fracture and cause porosity reduction. Understanding the distribution of these fine particles in the packed proppant is significant for preventing undesired formation damage and achieving expected engineering targets...
Two-fluid model (TFM) simulation predictions of bubble and particle dynamics in a 3D cylindrical fluidized bed are compared with magnetic resonance imaging (MRI) measurements from a prior study across a range of gas velocities, particle sizes, and bed heights. TFM simulations generally predict the number of bubbles and bubble diameters seen as a fu...
Two fluid modeling (TFM) has been widely used to simulate large-scale fluidized beds. Previous studies showed that TFM can capture bubble dynamic behavior like splitting and coalescence. Recently, a real-time magnetic resonance imaging (MRI) study found that two anomalous bubble collapse phenomena occurred when two bubbles are injected into incipie...
Water is the most important substance in nature. Imitating the formation of natural materials, molecular sieves have been synthesized under hydrothermal conditions and applied in industry. Herein, we reveal an unforeseen observation on a very special water‐induced structural dynamic process of these materials. Dynamic and reversible breaking and fo...
Water‐induced structural dynamic and reversible breaking and forming of T‐O‐T bonds in a molecular sieve under mild hydrothermal conditions offers the potential to widen their range of applications. As a result, a novel ship‐in‐a‐bottle strategy for acidity identification and catalyst modification by introducing bulky probe molecules into a small‐p...
Electrical capacitance tomography has been widely used to obtain key hydrodynamic parameters of gas–solid fluidized beds, which is normally realized by first reconstructing images and then by analyzing these images. This indirect approach is time‐consuming and hence difficult for on‐line monitoring. Meanwhile, considering recurrence of similar flow...
Image reconstruction plays a key role in the application of electrical capacitance tomography (ECT). Although many different algorithms have been developed in the past, it is often difficult to obtain satisfactory images in all imaging regions by use of a single algorithm due to the soft-field nature of ECT. This motivated us to develop a novel ECT...
Electrical capacitance tomography (ECT) is a non-intrusive and non-invasive imaging technique
for visualisation of material distribution, e.g. in a gas-solids fluidised bed. So far, ECT has been used in gas solids fluidised beds at ambient temperature successfully. However, ECT has been rarely used in high temperature gas-solids fluidised bed, whi...
The mechanisms underlying homogeneous fluidization of Geldart A particles have been debated for decades. Some ascribed the stability to interparticle forces, while others insisted a purely hydrodynamic explanation. Valverde et al. (2001) fluidized 8.53−μm (i.e., Geldart C) particles by the addition of fumed silica nanoparticles and found that even...
Electrical Capacitance Tomography (ECT) provides a non-intrusive means to visualize cross-sectional material distribution of gas-solid bubbling fluidized beds. Successful application of ECT strongly depends on the image reconstruction algorithm used. For on-line measurements of bubbling fluidized beds, employing an algorithm that can produce high-q...
The corrosion inhibition behavior of methyl violet in the absence and presence of bromide ion on mild steel in sulfuric acid solution has been studied by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results indicate that the corrosion of mild steel is obviously reduced by methyl violet in combination wi...
The corrosion inhibition of cold rolled steel in sulphuric acid solution by methyl violet in the absence and presence of chloride ion has been studied. The adsorption of methyl violet on the steel surface is found to obey the Langmuir adsorption isotherm with and without chloride ion. The studies reveal that the single methyl violet is not an effec...
