
Xinping ZhouHuazhong University of Science and Technology | hust
Xinping Zhou
PhD
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109
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Publications
Publications (109)
A horizontal cylinder with a concave cross-section partially submerged in a liquid at a given position may permit multiple menisci around itself. The number and stabilities of the menisci are analysed, and how the menisci change during the processes of gradually hoisting and lowering the cylinder is explained by bifurcation theory. The restoring fo...
A two-dimensional system with a floating cylinder confined between two parallel vertical stationary plates partially immersed in an infinite liquid bath in a downward gravity field is considered. The equilibrium states of the system are investigated using the Young–Laplace equation in two dimensions. According to the symmetry of menisci at both sid...
Despite the widespread occurrence of pendant drops in nature, there is still a lack of combined studies on their dynamic and static stability. This study focuses on the dynamic and static stability of elongated drops with either a free or pinned contact line on a plane. We first examine static stability for both axisymmetric and non-axisymmetric pe...
A macroscale floating object moving downwards will encounter an increasing buoyancy force exerted by the liquid. However, considering the surface tension and the deformed meniscus, we find an exotic floating object of specific shape that withstands a constant total force exerted by the liquid when it moves vertically and slowly. This constant total...
Keeping a tube from being plugged by a fluid is an important process in applications. An interesting re-entrant phenomenon for the capillary state with the occluding state sandwiching the non-occluding state from both the high- and low-Bond-number regions can appear by inserting a rod into a horizontal tube at an eccentric position (Tan et al ., J....
In this paper, we simulate the process of two-dimensional axisymmetric fluid–structure coupling of a droplet impacting on a flexible disk. The effects of dimensionless disk stiffness ( K = 0.1–1000), Weber number ( We = 1–500) and contact angle ( θ = 130° and 60°) on the dynamics of the droplet impacting on the flexible disk are analysed. The resul...
Bistable states for a sufficiently large amount of liquid can appear in an eccentric capillary due to the eccentricity effect under zero gravity ( J. Fluid Mech , vol. 863, 2019, pp. 364–385). A transverse body force, which can lead to rich physical phenomena of a droplet, may lead to multistable states (bistability, tristability and the likes) of...
Direct numerical simulations of the droplet impact on a flat solid surface with an annular part are conducted. We investigate droplet impact on a superhydrophobic substrate with a superhydrophilic annulus to understand the formation conditions of droplets in different states. The location and size of superhydrophilic annulus are carried out through...
An interesting resurrection phenomenon (including the initial complete submersion, subsequent resurfacing and final rebounding) of a superhydrophobic sphere impacting onto a liquid bath was observed in experiments and direct numerical simulations by Galeano-Rios et al. ( J. Fluid Mech. , vol. 912, 2021, A17). We investigate the mechanisms of the li...
Interfacial capture of particles and droplets is important in practical applications. Interfacial capture owing to the surface tension force occurs only when the target (particle or droplet) is close to the collector, leading to low efficiency with collector or collector arrays. An elliptical cylinder instead of a common circular cylinder is a meth...
Two-dimensional (2-D) direct numerical simulations of a compound droplet (a non-magnetizable droplet wrapped in a ferrofluid droplet) suspended in a non-magnetizable ambient fluid under a rotating uniform magnetic field are carried out. The motion and deformation of the compound droplet are studied. The numerical results show that there are two sta...
Enhancing the aerodynamic performance of bristled wings is an important topic for small flying robotics. This paper numerically investigates this situation at very low Reynolds numbers by using elliptic cylinders as the bristles instead of circular cylinders. Optimal configuration of the bristled wing with five elliptic cylinders is obtained, which...
Biological water striders have advantages such as flexible movement, low disturbance to the water surface, and low noise. Researchers have developed a large number of biomimetic water strider robots based on their movement mechanism, which have broad application prospects in water quality testing, water surface reconnaissance, and search. This arti...
Natural oscillations of sessile drops with a free or pinned contact line in different gravity environments are studied based on a linear inviscid irrotational theory. The inviscid Navier–Stokes equations and boundary conditions are reduced to a functional eigenvalue
problem by the normal-mode decomposition. We develop a boundary element method mode...
Depositing drops on a solid surface without entrapping bubbles is desirable for many spray coating and printing applications. Tian et al. [J. Fluid Mech. 946, A21 (2022)] reported that an electric field can be applied to eliminate air bubble entrapments for neutral drops. Herein we provide a complete physical picture of the entire process of a drop...
This paper theoretically studies the effect of eccentricity on the conditions of capillary emptying (determined by critical Bond number) in a horizontal annular tube in a downward gravity field. Experiments are conducted to compare with theoretical results. We find that non-horizontal eccentricity can lead to the occurrence of a re-entrant liquid-s...
When a charge neutral drop impacts on a flat solid substrate, a small air bubble is always trapped underneath due to the lubrication pressure coming from the viscous stress in the squeezed air film. Herein we find experimentally and numerically that the process of the air entrapment and the initial contact state of the drop with the substrate can b...
Using seawater as the working medium, the seawater hydraulic system has significant advantages in the deep sea, such as eliminating contamination caused by oil leaks, no oil tanks, and the ability to automatically adapt to sea depths. As working depths increase, seawater hydraulic technology faces enormous challenges. First, the physical and chemic...
Liquid bridge solidification has important applications in industry. In this paper, the solidification process of vertical axisymmetric liquid bridges between two horizontal discs is numerically simulated with the effects of supercooling and gravity. The mathematical model consists of two parts: one is to use the equivalent heat capacity method to...
Aerodynamics of a flapping foil at low Reynolds number in close proximity to the ground in aperture effect are studied by numerical simulations based on the normal hovering motion mode. A vortex street is interestingly generated by both ground and aperture effects and the rotation of the foil. The study reveals that the aperture takes a force-reduc...
Near-field radiative heat transfer (NFRHT) governed by evanescent waves, provides a platform to thoroughly understand the transport behavior of nonradiative photons, and also has great potential in high-efficiency energy harvesting and thermal management at the nanoscale. There have been numerous and impactful progresses of theories and experiments...
The freely falling of solid bodies in viscous liquids is an interesting issue concerned with many hydrodynamics and engineering problems. The eccentricity of the solid bodies may lead to new dynamic behaviors and complex paths of falling. Eccentric annular disks with holes covered by transparent tapes are used to study the effect of eccentricity on...
Aerodynamics of a flapping foil at low Reynolds number in close proximity to the ground in aperture effect are studied by numerical simulations based on the normal hovering motion mode. A vortex street is interestingly generated by both ground and aperture effects and the rotation of the foil. The study reveals that the aperture takes a force-reduc...
Capillary plugs in horizontal rectangular tubes with non-uniform contact angles - Volume 901 - Chengwei Zhu, Xinping Zhou, Gang Zhang
The solidification of liquid bridges plays an important role in many applications. Previous research on droplet solidification has found that supercooling and gravity have certain effects on physical properties and droplet shape during solidification. In this paper, axisymmetric water bridge solidification is studied from theory and experiment. A f...
The diffusive nature of heat flow lays a formidable obstacle for directional heat manipulation, not akin to the wave-governed electromagnetics that can be well controlled in intensity and direction. By modulating the near-field radiative heat transfer among graphene/SiC core-shell (GSCS) nanoparticles, we propose the concept of thermal routing to a...
Formation regimes of vortex rings in thermals - Volume 885 - Xinping Zhou, Yangyang Xu, Wanqiu Zhang
Active control of radiative heat transfer still remains open due to its exciting application potential. In view of this, we present a theoretical demonstration of dynamically tunable near-field radiative heat transfer (NFRHT) between two multilayer hyperbolic metamaterials (consisting of alternating layers of a magneto-optical (MO) material and a d...
Capillary surfaces in and around exotic cylinders with application to stability analysis - Volume 882 - Fei Zhang, Xinping Zhou
Sloped solar collector (SSC) is more efficient than horizontal solar collector due to its greenhouse effect and chimney effect driving the updraft. Large-scale SSC is proposed to be constructed on natural mountain slope to enhance the performance of solar chimney power generation. However, the surfaces of the natural mountain slopes always are not...
The numerical simulation of a large-scale hybrid SCPP (an additional waste heat source is connected to the collector-to-chimney transition section) is performed based on a transient model. The daily dynamic profiles of power output, mass flow rate of condensed water and temperature at a representative point for continuous 24 h are obtained, as well...
We theoretically demonstrate the modulation and splitting of radiative heat flux in a three-body system consisting of graphene/SiC core-shell (GSCS) nanoparticles on the basis of their highly tunable polarizabilities, which play a dominant role in the coupling of localized surface resonance. The excitation of multiple photon tunneling modes enables...
Integration with the grid is the general trend in the development of solar chimney power plant (SCPP). It is important to dispatch the electricity from the grid-connected SCPP in a proper manner. The power dispatching scheme would be changed by various heat storages which can control the power output profile of the SCPP. Optimal design of the heat...
This paper develops a mathematical model to investigate the performance of a modified solar chimney power plant (MSCPP) for purposes of both power generation and vegetation. It then estimates the net added benefit. Results show that with the vegetation area enlarging, the mass flow rate (MFR) of the vapor increases, and more heat is used as the lat...
A model dealing with the conditions of equilibrium and initial stability of floating bodies in two dimensions with an arbitrary cross-section has been proposed recently (J. Fluid Mech. 847:489-519, 2018). The method is applied to investigate the hydrostatics and stability of the configuration of an elliptical cylinder floating on an infinite liquid...
Simulations of divergent-chimney solar power plants (DSPPs) are conducted, and the DSPP performance studied by changing chimney outlet-to-inlet area ratios (COAR, representing the degree of divergence) over a wide range of values. Study method involves the use of total pressure potential (TPP) which consists of buoyancy and static pressure recovery...
A model for calculating the force profile and the moment profile of a floating body in two dimensions with an arbitrary cross-section is proposed. Three types of cross-sections with different contact angles and densities are calculated by using the model to determine the vertical and rotational equilibria and their stabilities. Results show that th...
This technical brief develops a theoretical model of all the pressure losses in the solar chimney power plant (SCPP, also called solar updraft power plant) and analyzes the pressure losses for different chimney internal stiffening appurtenance (SA) structures, different roof heights, and different collector support parameters. Results show that the...
This paper conducts numerical simulations of a large scale solar chimney power plant (SCPP, also called solar updraft power plant) based on an assumed expression of daily ambient temperature profile with a constant peak. It then evaluates the influence of the diurnal ambient temperature range (DATR) on the performance of the large scale SCPP. Resul...
A solar updraft power plant (SUPP) technology is a promising large-scale utilizing technology of renewable energy resource. Since the feasibility of the technology was demonstrated by the successful operation of the Manzanares pilot prototype, the plant performance has been widely studied. This paper carries out computational fluid dynamics (CFD) s...
Air quality in the Chinese urban areas has been worsened severely in the past few years and serious haze problems have been experienced frequently. Here, filter-contained urban updraft tower (FUUT) is proposed to be an approach to govern the air pollution and generate electricity. Due to buoyancy with the help of urban heat island (UHI), the air wi...
In this paper, a theoretical model of solar chimney power plants (SCPPs) is presented based on compressible ideal gas law assumptions. The theoretical optimal turbine pressure drop factors (TPDFs) for constant and nonconstant densities (CD and NCD) are studied, and the effects of flow area parameters examined. Results show that the theoretical opti...
The three-plate system in which a vertical plate is located between two spaced parallel plates partially immersed in an infinite water bath in a downward gravity field is considered. With different contact angles and distance between the plates on both sides, the force profiles of the middle plate in this three-plate system are investigated using t...
A solar updraft power plant (SUPP) also called a solar chimney power plant is a kind of promising power
generation device that operates naturally under the indoor air buoyancy at the cost of low operation and
maintenance cost without use of fuel and cooling water and without need of refuse disposal. To date this
SUPP technology, the feasibility of...
In this paper, a novel Bian stone thermal therapy assisted by using solar radiation is proposed for safe thermal therapy on patients. A mathematical model is developed based on heat balance, and the performance of heat transfer from the novel Bian stone thermal therapy system to human body is studied. Sensitivity analysis is also performed. Fluid h...
Solar updraft tower power generation has been demonstrated to be a promising approach for future applications of solar radiation to provide energy. In this paper, the history of the solar updraft tower power plant (SUTPP, also called solar chimney power plant) technology is reviewed, its characteristics are presented, and its principle is described...
Liquid zinc flow in a galvanising bath was numerically modelled for four cases, and flow field using three-dimensional views was analysed. Flow pattern analysis shows that there are two vortexes (circulations) close to the zinc flow surface and another two below them, which are attributed to strip movement and two guide rolls. Jets from air knives...
A thermal growth model for microalgae that are not heavier than water with the consideration of heat transfer and growth-temperature dependence in photobioreactor (PBR) is developed. The microalgae growth performance is studied, and influences of various parameters on the performance are examined. Improved methods are proposed to increase the bioma...
Due to rapid urbanization, dense haze is formed in some Chinese cities where urban heat island (UHI) effect is aggravated. The urban haze problem has become a touchy issue significantly affecting humans living and working in the cities. Solar updraft tower (SUT) is a device that can drive warm air up to high altitude under the effect of natural buo...
The zinc flow in a galvanising bath is numerically simulated for three cases, and the flow field is analysed using three-dimensional views. It is found that the flow near the zinc surface directs from the strip to the ingot side when inductors are equipped and whether ingots are melting or not, and the flow direction is opposite to that near the zi...
The first generation biofuels primarily produced from crops compete with other food crops for arable land and are recently susceptible as safe and reliable renewable energy resources. The second generation biofuels produced from non-food feedstocks, mainly being microalgae, have been paid increasing attention to. Compared to the first generation bi...
In this paper, based on the mathematical models of microalgae growth, the performance of microalgae growth in nitrogen-limited and light-limited continuous culture is investigated and the effect of important factors on the growth is examined. The dilution rate and the influent inorganic nitrogen concentration have been shown to have a significant i...
This paper evaluates the Solar Chimney Power Plant performance subject to adverse solar radiance conditions. For that, numerical simulations are performed to estimate the optimal ratio of the turbine pressure drop to the total pressure potential (x-factor) as an independent control variable. The results show that x-factor values remain around 0.8 f...
By taking a galvanizing bath with inductors from an Iron and Steel Co.,
Ltd as an example, the distributions of Lorentz force and generated heat
in the inductor are simulated. As a result, the zinc flow and the
temperature distribution driven by the Lorentz force and the generated
heat in the inductor of a galvanizing bath are simulated numerically...
Microalgae are considered a promising biofuel resource to fix carbon dioxide (CO2), which can support social development and environmental improvement in the future. In this paper, characteristics of microalgae growth with two parameters of solar radiation and ambient temperature are investigated based on industrial-scale microalgae bulk growth mod...
The goal of this study is to analyze particularly the sensible heat storage physical process in a Solar Updraft Tower collector taking into account the transient heat transfer in ground through conduction, convection and solar radiation and the use of water bags. Simulations were carried out varying the thickness of some water bags sets with and wi...
The characteristics of time-varying mean wind pressure distribution on the surface of solar updraft tower (SUT, an axisymmetric structure) in a translating thunderstorm downburst is discussed based on revised Chen and Letchford's empirical model, in which Wood et al.'s empirical model for vertical profile of radial velocity, revised Poreh and Cerma...
Seismic load is one of the main design loads of solar updraft towers. The tower structure is very flexible as a result of its huge height and this makes it have a high period of the first relevant eigenmotion and not sensitive to general far-fault earthquake. However, near-fault ground motions have many different characteristics and it can be more...
Thunderstorm downbursts are responsible for numerous structural failures around the world. The wind characteristics in thunderstorm downbursts containing vortex rings differ with those in 'traditional' boundary layer winds (BLW). This paper initially performs an unsteady-state simulation of the flow structure in a downburst (modelled as a impinging...
Vibration characteristics of micro-scale simply supported cylindrical shells conveying fluid and embedded in an elastic medium are analysed using the new equations of motion developed based on the modified couple stress theory. It is found that the natural frequencies predicted by the established model are size-dependent, and change with the fluid...
A new theoretical dynamic model is developed, based on the modified couple stress theory, for the vibration analysis of micro- and nano-shells by introducing one internal material length scale parameter. After discretization with the energy approach leading to the Lagrange equation
of motion, the natural frequency is analytically solved. The micros...
Based on the Flügge shell theory, equations of motion of ring-stiffened thin-walled cylindrical shells conveying fluid are developed with the aid of the Hamilton's principle. Analysis is carried out on the vibration and stability of the ring-stiffened shells conveying fluid, and the effects of fluid velocity, the Young modulus, the size, and the nu...
Cited By :12, Export Date: 4 January 2015
Cited By :12, Export Date: 4 January 2015
This paper assesses the sustainable biomass resource for energy in China. Assessment has been carried out for the following resources: (i) agricultural residues, (ii) forest residues, and (iii) municipal solid waste (MSW). The potential of each resource is estimated for the base years 2008, 2008, and 2007. The energy potentials of these resources i...
Utilization of solar chimney (SC) for power generation has proved to be a promising approach for future applications. This paper provides a comprehensive picture of research and development of SC power technology in the past few decades. The description, physical process, experimental and theoretical study status, and economics for the conventional...
A solar chimney power plant (SCPP) is proposed to be built in Qinghai-Tibet Plateau where there is abundant solar radiation, high direct solar radiation low atmospheric temperature, large diurnal temperature range, and lots of salt lakes working as heat storage system, which can help to improve the power output of SCPP. The plant is expected to pow...
An alternative method of heat and moisture extraction from seawater under the collector of a solar chimney system for power generation and seawater desalination is investigated with the aim of estimating the output of power and fresh water when used in seawater desalination using one-dimensional compressible flow model. It is found that the tempera...
An accurate numerical model including three-dimensional (3D) steady Navier–Stokes equations in Cartesian coordinate system is developed to evaluate the performance of a compressible flow through a solar chimney. This model is validated by comparison with the previous numerical simulated results for one-dimensional compressible flow in a proposed 15...
Solar chimney thermal power technology that has a long life span is a promising large-scale solar power generating technology. This paper performs economic analysis of power generation from floating solar chimney power plant (FSCPP) by analyzing cash flows during the whole service period of a 100Â MW plant. Cash flows are influenced by many factors...
A novel solar thermal power plant with a floating chimney stiffened on a mountainside segment by segment is proposed. The novel power plant is suitable for the special topography in China (i.e., a vast desert belt surrounded by high mountain chains up to thousands of meters). An investigation of its performance is carried out using a simple mathema...
The concept of the solar chimney thermal power technology was proven with the successful operation of the Manzanares prototype built in the 1980s. However, all previous attempts at producing energy from a commercial solar chimney thermal power plant on a large scale have failed because of bad engineering and safety. A novel concept for producing en...
An alternative method of heat extraction from salt gradient solar ponds to solar collector is investigated with the aim of night operation for solar chimney power system. Some details of the combined power system integrated with solar ponds and solar chimney power system are also provided. Using a developed mathematical model, theoretical analyses...
This paper analyzes utilization of carbon-negative biofuels from low-input high-diversity grassland biomass on degraded lands (LIHD) for energy including energy equivalent to green house gases (GHG) capture and storage. The results show that the energy output of LIHD biomass on degraded soil is nearly equal to that of ethanol from conventional corn...