Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Zhaolin Gu is active.

Publication


Featured researches published by Zhaolin Gu.


Energy Conversion and Management | 2002

Performance of supercritical cycles for geothermal binary design

Zhaolin Gu; Haruki Sato

Supercritical cycles for geothermal power generation systems are studied to raise the power output and thermal efficiency by selecting natural fluids and new organic working fluids as the working fluids and optimizing the cyclic parameters, especially the condensing temperature or pressure. For a given liquid dominated geothermal resource, thermodynamic parameters, using propane, R-125 and R-134a as the working fluids, respectively, are calculated to show the features of supercritical power cycles and compare to other design results shown in references. Greater power output shows that propane and R-134a are appropriate working fluids of supercritical cycles for geothermal binary design.


Energy Conversion and Management | 2001

Optimization of cyclic parameters of a supercritical cycle for geothermal power generation

Zhaolin Gu; Haruki Sato

A supercritical power cycle with a regenerative process is studied to reach the maximum thermal efficiency by the choice of an appropriate working fluid and optimization of the cyclic state parameters, especially the condensing temperature or pressure. For given geothermal resources, the thermodynamic state parameters are calculated to show the features of the supercritical power cycle compared to other design results. The criteria for the choice of working fluids are also set up.


Indoor and Built Environment | 2011

Numerical Simulation and In Situ Investigation of Fine Particle Dispersion in an Actual Deep Street Canyon in Hong Kong

Yunwei Zhang; Zhaolin Gu; S.C. Lee; Tzung-May Fu; K.F. Ho

This paper reports a computational fluid dynamics simulation of airflow and fine particle (PM2.5) dispersion in the street canyon in Hong Kong, using large eddy simulation. An aspect ratio (AR) of 2.7 and a Reynolds number of 5 × 106 with a one main vortex, were used. This study focused mainly on the vehicle-induced momentum source and PM2.5 concentrations were measured at 10 altitudes near the leeward wall in the street canyon, to provide high resolution measurements for model validation. The simulated PM2.5 concentrations agreed well with the measurements, (R = 0.85). The concentration was higher at the lower part near the leeward wall than the upper part. Higher concentration was found near the roof level. A near-uniform vertical dispersion of PM 2.5 near the windward wall was demonstrated; and the average concentrations were lower than found near the leeward wall. The intermittent escape of the PM2.5 above the canyon at the roof level occurred mainly at the centre and near windward wall areas. The results demonstrated that a reduction in the AR can be conducive to pollutant dispersion in street canyon planning. The findings of this research would inform building designers to formulate effective strategies such as positioning of ventilation air intake, for the control of ingress of PM2.5 into building environments.


Applied Thermal Engineering | 2002

Thermo-economical analysis between new absorption-ejector hybrid refrigeration system and small double-effect absorption system

Liben Jiang; Zhaolin Gu; Xiao Feng; Yun Li

Abstract The comparisons of coefficient of performance and the cyclic characteristics between the three-pressure absorption–ejector hybrid refrigeration system (AEHRS) and small double-effect absorption refrigeration system are carried out. The thermo-economical analysis models of the two systems in two cases of high-temperature heat resources: waste heat resources and natural gas fuel are presented. The thermo-economical performances of the two systems in two modes of the running hours per year (600 and 1000 h) are calculated and discussed to show the commercial perspective of the AEHRS.


Journal of the Atmospheric Sciences | 2006

Numerical Simulation of Dust Lifting within Dust Devils—Simulation of an Intense Vortex

Zhaolin Gu; Yongzhi Zhao; Yun Li; Yongzhang Yu; Xiao Feng

Abstract Based on an advanced dust devil–scale large-eddy simulation (LES) model, the atmosphere flow of a modeled dust devil in a quasi–steady state was first simulated to illustrate the characteristics of the gas phase field in the mature stage, including the prediction of the lower pressure and higher temperature in the vortex core. The dust-lifting physics is examined in two aspects. Through the experimental data analysis, it is verified again that the horizontal swirling wind can only make solid particles saltate along the ground surface. Based on a Lagrangian reference frame, the tracks of dust grains with different density (material) and diameter are calculated to show the effect of dust particles entrained by the vertical swirling wind field. The movement of solid particles depends on the interactions between the aloft dust particles and the airflow field of dust devils, in which the drag and the centrifugal force component on the horizontal plane are the key force components. There is the trend o...


Atmosphere-ocean | 2004

Mechanism and large eddy simulation of dust devils

Yongzhi Zhao; Zhaolin Gu; Y. Z. Yu; Y. Ge; Yun Li; Xiao Feng

Abstract Large Eddy Simulations (LES) of vertical convective vortices and dust devils in the terrestrial Convective Boundary Layer (CBL) are presented. A CBL‐scale simulation and a dust‐devil‐scale simulation are preformed at different resolutions. The CBL‐scale simulation is performed to study the generation of vertical vortices and the dust‐devil‐scale simulation is performed to study the detailed structures and stages of dust devil development. The simulation results show that dust devils undergo three stages of development as the swirl ratio increases: a weak vortex stage, a single‐celled vortex stage and a two‐celled vortex stage. The structure of a dust devil can be divided into four regions: outflow, core, corner and inflow layer. The different structures and characteristics of the modelled dust devil during various stages of development and the influence of the surface on the dust devil profile are described using some of the simulation results as illustrations. The causes of the different structures and characteristics are analysed through the interplay between the rotation, the radial pressure gradient, the buoyancy and the axial pressure gradient. Dust devils are a type of concentrated vortex similar to tornadoes. The differences in the structure and characteristics of tornadoes and the modelled dust devils are discussed in this paper. The carrying aloft of sand particles within the modelled dust devil is explored using a Lagrangian coordinate system. Sand particles can be transported by the updraft with particles of varying diameters follow different tracks.


Applied Thermal Engineering | 2001

Using supercritical heat recovery process in Stirling engines for high thermal efficiency

Zhaolin Gu; Haruki Sato; Xiao Feng

Stirling engine, using a composite working fluid, such as two-component fluid: gaseous carrier and phase-change component and single multi-phase fluid as the working fluid is studied to get high thermal efficiency. In Stirling engine with a composite fluid, a thermodynamic supercritical heat recovery and heating process is proposed and demonstrated to improve the heat transfer of the heat regenerator and cooler of common gaseous Stirling engine. The criteria for the choice of the working fluids are also formulated.


Journal of Micromechanics and Microengineering | 2013

Numerical simulation of the cone–jet formation and current generation in electrostatic spray—modeling as regards space charged droplet effect

Wei Wei; Zhaolin Gu; Sheng Wang; Yunwei Zhang; Kangbin Lei; Kiwamu Kase

A physical model of the electric field induced by charged droplets taking account of the effect of space charged droplet emitted from the tip of cone–jet to the external electric field is proposed. Combining this model with the fluid flow equations and charge conservation equation, the evolution of the cone–jet is simulated. The diameter of droplets emitted from the cone–jet tip and current on cone–jet are predicted at various applied voltages and flow rates. The calculated droplet diameter agrees well with experimental measurement. For low conductivity liquid, the droplet diameter decreases with the increment of applied voltage, but decreases with the reduction of flow rate. The simulation result also indicates that the current on the cone–jet increases linearly with the applied voltage. The electric field induced by charged droplets results in the decrease of the cone angle and the presence of space charged droplets has a non-negligible effect on the operation parameters.


Environmental Science & Technology | 2013

Primitive environment control for preservation of pit relics in archeology museums of China.

Zhaolin Gu; Xilian Luo; Xiangzhao Meng; Zanshe Wang; Tao Ma; Chuck Yu; Bo Rong; Ku Li; Wenwu Li; Ying Tan

Immovable historical relics in some archeology museums of China suffer deterioration due to their improper preservation environment. The existing environmental control systems used in archeology museums are often designed for the amenities of visitors, and these manipulated environments are often inappropriate for the conservation of abiotic relics. This paper points out that the large open space of the existing archeology museum could be a cause of deterioration of the relics from the point of view of indoor air convective flow. The paper illustrates the need to introduce a local pit environmental control, which could reintegrate a pit primitive environment for the preservation of the historical relics by using an air curtain system, orientated to isolate the unearthed relics, semiexposed in pits to the large gallery open space of the exhibition hall.


Indoor and Built Environment | 2015

Desiccation cracking of earthen sites in archaeology museum – A viewpoint of chemical potential difference of water content

Xilian Luo; Zhaolin Gu; Chuck Yu

Unearthed relics and earthen sites are historical evidence of our cultural heritage. Many of them are referred to as immobile cultural relics since both the relics-in-itself and their surroundings are our historic heritage of past emperor’s burial with significant historical importance such that they cannot be moved into indoor-display museums. Researchers have studied the specific environmental specifications to establish the desired steady temperature, humidity and air quality for collections and visitors in indoor-display museums. However, due to the unique exhibition characteristics, the conservation of earthen sites is still a challenge to environmental scientists and technologists, and how to effectively protect these ancient sites has been a major concern globally. Archaeology museum is developing advanced techniques to prevent weathering of relics caused by the sun, wind and rain. The in-situ relics in archaeology museum are far from being well preserved because of the lack of understanding of site conservation and the impact of indoor micro-climatic conditions. Many of them are suffering deteriorations or even ruins due to improper preservation environment adopted for maintenance of relics. Among the hazards that unearthed relics are facing with, desiccation cracking is the most common and problematic. The drying layer of the earthen site in the Banpo museum (Xi’an, China) is thicker than 0.4m (see Figure 1(a)). The same phenomena are also found in the Emperor Qin’s Terra-Cotta Warriors and Horses Museum (see Figure 1(b)), the water content of the earthen site decreased from 15% to 22% in 1994 when it was excavated to less than 5% now, such that serous shrinkage and cracking occurred on the surface of the site. To upgrade the conservation of the relics in archaeology museums, great efforts have been made in recent years, e.g. maintenance of a high relative humidity (RH) and space division in the exhibiting hall have been implemented in archaeology museum as a part of the preservation regime. The underground exhibiting hall of Hanyangling Museum (Xi’an, China) is such a modern archaeology museum (see Figure 1(c)). It exhibits partially exposed pits containing pottery figurines in the co-burial grave of the fourth Emperor (188–141 B.C.) and Queen of Han Dynasty, China. The enclosed space for relics’ domain is being maintained at about 24 C in summer and 16 C in the winter. Moreover, the RH has been maintained at a level higher than 95% to prevent the drying of unearthed relics and sites. However, the water content of the earthen site in the exhibiting hall still decreased from over 15% when it was excavated in 2006 to around 4% in 2009. In addition to the desiccation cracking, gypsum was found to deposit on the surface of relics due to the transport mechanism by which the carbonates were diffused and migrated with moisture across the air-relic-topsoil complex interfaces. The carbonates would react with the penetrating SO2 from the ambient atmosphere to form sulphates (see Figure 1(d)). The reason why desiccation cracking occurs in high humidity environment is not entirely clear. The conservation protocol, i.e. space division and maintaining a high RH as a preservation regime, has been considered by archaeologists as an approved practice and therefore the protocol was applied to new archaeology museums; however, cracking still persists in the terracotta relics and earthen sites. The desiccation cracking of unearthed relics and excavated sites in these archaeology museums seems to be a spontaneous process even though the RH of the atmospheric environment was at approximately the ceiling value (100%). In order to clarify the mechanism of moisture migration behind the desiccation cracking phenomenon and to verify whether a high RH is adequate to prevent the desiccation cracking of unearthed in-situ relics, the chemical potential analysis

Collaboration


Dive into the Zhaolin Gu's collaboration.

Top Co-Authors

Avatar

Yun Li

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Zanshe Wang

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Xilian Luo

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Shiyu Feng

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Yunwei Zhang

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Chuck Yu

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Xiongpo Hou

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Junwei Su

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar

Xiufeng Gao

Xi'an Jiaotong University

View shared research outputs
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge