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| 1 | Validation of full cavitation model in cryogenic fluids显示文摘Numerical simulation of cavitation in cryogenic fluids is important in improving the stable operation of the propulsion system in liquid-fuel rocket. It also represents a broader class of problems where the fluid is operating close to its critical point and the thermal effects of cavitation are pronounced. The present article focuses on simulating cryogenic cavitation by implementing the 'full cavitation model', coupled with energy equation, in conjunction with iterative update of the real fluid properties at local temperatures. Steady state computations are then conducted on hydrofoil and ogive in liquid nitrogen and hydrogen respectively, based on which we explore the mechanism of cavitation with thermal effects. Comprehensive comparisons between the simulation results and experimental data as well as previous computations by other researchers validate the full cavitation model in cryogenic fluids. The sensitivity of cavity length to cavitation number is also examined. | CAO XiaoLi ZHANG XiaoBin QIU LiMin GAN ZhiHua | 2009 | Chinese Science Bulletin2009，54，10： | 13 |
| 2 | Modeling cavitation flow of cryogenic fluids with thermodynamic phase-change theory显示文摘Cavitation is the formation of vapor bubbles within a liquid where the flow dynamics causes the local static pressure to drop below the vapor pressure. The so-called full cavitation model (FCM) developed by Singhal has been widely used in numerical modeling of the cavitation flow for thermosensible and non-thermosensible fluids. Within the FCM, the bubble size is taken to be equivalent to the maximum possible value to forego the calculation of bubble number density. We developed a new cavitation model by recalculating the bubble radius in FCM to account for the effects of local pressure. The new model was obtained by combining the thermodynamic phase-change theory and the Young-Laplace equation with the assumption of thermodynamic equilibrium during the cavitation process. The cavitation calculations were performed based on the mathematical framework of the homogeneous equilibrium flow model and the transport-equation-based model for vapor phase mass fraction. The model was validated by modeling the cavitating flow of liquid nitrogen and liquid hydrogen through NASA hydrofoil and Ogive with consideration of the phase-change thermal effects. The temperature and pressure distributions with the new model are found to agree well with data from existing experimental studies, as well as the simulations with the FCM. | ZHANG XiaoBin WU Zhao XIANG ShiJun QIU LiMin | 2013 | Chinese Science Bulletin2013，58，4： | 9 |
| 3 | Validation of dynamic cavitation model for unsteady cavitating flow on NACA66显示文摘Unsteady cavitating flow is extremely complicated and brings more serious damages and unignorable problems compared with steady cavitating flow.CFD has become a practical way to model cavitation;however,the popularly used full cavitation model cannot reflect the pressure-change that the bubble experiences during its life path in the highly unsteady flow like cloud cavitating.Thus a dynamic cavitation model(DCM)is proposed and it has been considered to have not only the first-order pressure effects but also zero-order effect and can provide greater insight into the physical process of bubble producing,developing and collapsing compared to the traditional cavitation model.DCM has already been validated for steady cavitating flow,and the results were reported.Furthermore,DCM is designed and supposed to be more accurate and efficient in modeling unsteady cavitating flow,which is also the purpose of this paper.The basic characteristic of the unsteady cavitating flow,such as the vapor volume fraction distribution and the evolution of pressure amplitude and frequency at different locations of the hydrofoil,are carefully studied to validate DCM.It is found that not only these characteristics mentioned above accord well with the experimental results,but also some detailed transient flow information is depicted,including the re-entrant jet flow that caused the shedding of the cavity,and the phenomenon of two-peak pressure fluctuation in the vicinity of the cavity closure in a cycle.The numerical results validate the capability of DCM for the application of modeling the complicated unsteady cavitating flow. | ZHANG XiaoBin ZHANG Wei CHEN JianYe QIU LiMin SUN DaMing | 2014 | Science China(Technological Sciences)2014，57，4： | 8 |
| 4 | Investigation on regenerator temperature inhomogeneity in Stirling-type pulse tube cooler显示文摘Regenerator is one of the most crucial components to pulse tube cooler (PTC) and thermoacoustic engine. As such regenerator is scaled up to high-power, the thermal and hydrodynamic communication transverse to the acoustic axis gets weaker and weaker. Under this condition, any unsymmetric factor could cause serious instability to the cooler or engine, which degrades their performance. Investigation has been carried out on a high-power two-stage thermal-coupled U-shape Stirling-type PTC. By detailed circumferential temperature measurements along the middle heat exchanger and second stage regen-erator, a kind of temperature inhomogeneity caused by unsymmetric pre-cooling effect of inter-stage thermal bridge was found in the lower part of the regenerator of the PTC. The temperature inhomoge-neity originating from the middle heat exchanger of the second stage regenerator amplified itself in the lower part of the regenerator and then internal streaming formed. The maximal radial temperature dif-ference could reach 30―40 K. Experimental results show that the temperature inhomogeneity intensi-fies with increased pre-cooling power and its direction can be reversed by changing the pre-cooling effect of the first stage PTC to heating effect by using external thermal load. This research shows that it is important to maintain the heating or cooling effects of heat exchangers uniform in high-power re-generative coolers and engines. | SUN DaMing MARC Dietrich GUENTER Thummes Qiu LiMin | 2009 | Chinese Science Bulletin2009，54，6： | 7 |
| 5 | Effects of surface tension on bubble growth in an extensive uniformly superheated liquid显示文摘The study of bubble growth in an extensive pool of liquid provides considerable insight into the mechanisms that play a role in bubble growth near a heated surface and in the cavitation phenomenon. This work focuses on analyzing the effects of surface tension on the growth rate for the thermally controlled stage of a single bubble in such a liquid. The conservation of energy equations, including the internal energy term for the bubble and that within boundary layer around it, are numerically solved. The complete temporal variations of the bubble in water and liquid nitrogen are investigated based on the assumption that the bubble growth is controlled only in sequence by inertia and heat. Thus, the two stages are subject to the continuity of the bubble growth, while the inertia-controlled stage is only formulated by the well-known Rayleigh solution. The thickness of the boundary layer around the bubble is also determined. The results are comparable with the Plesset-Zwick models and Forster-Zuber models, as well as available experimental data. It is found that the influence of internal energy on the rate of bubble growth is small enough to be ignored; however, the accumulative effects of the surface tension are significant and increase with a decrease in the degree of superheat. | ZHANG XiaoBin XIANG ShiJun CAO XiaoLi QIU LiMin | 2011 | Chinese Science Bulletin2011，56，30： | 4 |
| 6 | Perturbative countersurveillance metaoptics with compound nanosieves显示文摘The progress of metaoptics relies on identifying photonic materials and geometries,the combination of which represents a promising approach to complex and desired optical functionalities.Material candidate options are primarily limited by natural availability.Thus,the search for meta-atom geometries,by either forward or inverse means,plays a pivotal role in achieving more sophisticated phenomena.Past efforts mainly focused on building the geometric library of individual meta-atoms and synthesizing various ones into a design.However,those efforts neglected the powerfulness of perturbative metaoptics due to the perception that perturbations are usually regarded as adverse and in need of being suppressed.Here,we report a perturbation-induced countersurveillance strategy using compound nanosieves mediated by structural and thermal perturbations.Private information can be almost perfectly concealed and camouflaged by the induced thermal-spectral drifts,enabling information storage and exchange in a covert way.This perturbative metaoptics can self-indicate whether the hidden information has been attacked during delivery.Our results establish a perturbative paradigm of securing a safer world of information and internet of things. | Jiancai Xue Zhang-Kai Zhou Limin Lin Chao Guo Shang Sun Dangyuan Lei Cheng-Wei Qiu Xue-Hua Wang | 2019 | Light(Science & Applications)2019，8，1： | 4 |
| 7 | Self-organized phase-transition lithography for all-inorganic photonic textures显示文摘Realizing general processing applicable to various materials by one basic tool has long been considered a distant dream.Fortunately,ultrafast laser-matter interaction has emerged as a highly universal platform with unprecedented optical phenomena and provided implementation paths for advanced manufacturing with novel functionalities.Here,we report the establishment of a three-dimensional(3D)focal-area interference field actively induced by a single ultrafast laser in transparent dielectrics.Relying on this,we demonstrate a radically new approach of self-organized phase-transition lithography(SOPTL)to achieve super-resolution construction of embedded all-inorganic photonic textures with extremely high efficiency.The generated textures exhibit a tunable photonic bandgap(PBG)in a wide range from〜1.3 to〜2 pm.More complicated interlaced textures with adjustable structural features can be fabricated within a few seconds,which is not attainable with any other conventional techniques.Evidenee suggests that the SOPTL is extendable to more than one material system.This study augments light-matter interaction physics,offers a promising approach for constructing robust photonic devices,and opens up a new research direction in advaneed lithography. | Bo Zhang Dezhi Tan Zhuo Wang Xiaofeng Liu Beibei Xu Min Gu Limin Tong Jianrong Qiu | 2021 | Light(Science & Applications)2021，10，6： | 3 |
| 8 | Mid-infrared chalcogenide microfiber knot resonators显示文摘A novel type of mid-IR microresonator,the chalcogenide glass(ChG)microfiber knot resonator(MKR),is demonstrated,showing easy fabrication,fiber-compatible features,resonance tunability,and high robustness.ChG micro fibers with typical diameters around 3μm are taper-drawn from As2S3 glass fibers and assembled into MKRs in liquid without surface damage.The measured Q factor of a typical 824μm diameter ChG MKR is about 2.84×104 at the wavelength of 4469.14 nm.The free spectral range(FSR)of the MKR can be tuned from2.0 nm(28.4 GHz)to 9.6 nm(135.9 GHz)by tightening the knot structure in liquid.Benefitting from the high thermal expansion coefficient of As2S3 glass,the MKR exhibits a thermal tuning rate of 110 pm·℃^-1 at the resonance peak.When embedded in polymethyl methacrylate(PMMA)film,a 551μm diameter MKR retains a Q factor of 1.1×10^4.The ChG MKRs demonstrated here are highly promising for resonator-based optical technologies and applications in the mid-IR spectral range. | YU XIE DAWEI CAI HAO WU JING PAN NING ZHOU CHENGUANG XIN SHAOLIANG YU PAN WANG XIAOSHUN JIANG JIANRONG QIU XIN GUO LIMIN TONG | 2020 | Photonics Research2020，8，4： | 3 |
| 9 | A stability condition for turbulence model:From EMMS model to EMMS-based turbulence model显示文摘The closure problem of turbulence is still a challenging issue in turbulence modeling.In this work,a stability condition is used to close turbulence.Specifically,we regard single-phase flow as a mixture of turbulent and non-turbulent fluids,separating the structure of turbulence.Subsequently,according to the picture of the turbulent eddy cascade,the energy contained in turbulent flow is decomposed into different parts and then quantified.A turbulence stability condition,similar to the principle of the energy-minimization multi-scale(EMMS) model for gas-solid systems,is formulated to close the dynamic constraint equations of turbulence,allowing the inhomogeneous structural parameters of turbulence to be optimized.We name this model as the 'EMMS-based turbulence model',and use it to construct the corresponding turbulent viscosity coefficient.To validate the EMMS-based turbulence model,it is used to simulate two classical benchmark problems,lid-driven cavity flow and turbulent flow with forced convection in an empty room.The numerical results show that the EMMS-based turbulence model improves the accuracy of turbulence modeling due to it considers the principle of compromise in competition between viscosity and inertia. | Lin Zhang Xiaoping Qiu Limin Wang Jinghai Li | 2014 | Particuology2014，12，5： | 3 |
| 10 | Study on the onset temperature of a standing-wave thermoacoustic engine based on circuit network theory显示文摘Onset mechanism is one of the most fundamental issues in thermoacoustic field.However,the onset conditions and the phenomena happening in the onset process have not been well explained theoretically.In this paper,a novel model based on the circuit network analogy is proposed to predict the onset temperature of a standing-wave thermoacoustic engine.The activity and instability criteria are proposed to be the onset criteria in the model.The influences of the porosity of the heat exchanger and the stack,and the length of the resonant tube on the onset temperature are analyzed.The calculated results are in agreement with the experimental results,which indicates that the activity and instability criteria can be used to predict the onset conditions of a thermoacoustic engine. | QIU LiMin LAI BiHui ZHAO YiTao SUN DaMing ZHANG XueJun LI YanFeng | 2012 | Science China(Technological Sciences)2012，55，10： | 2 |
| 11 | Research Progress of Rice-Fish Integrated Farming显示文摘Rice-fish integrated farming( RFIF) can change the agricultural production pattern from mono-farming model to the co-farming model,and the stereoscopic and integrated farming system established by RFIF can change the flat production to the stereoscopic production. Therefore,RFIF is the important development direction for agriculture to change pattern and adjust structure. In order to further promote development of the research and application of RFIF,the general development situation of RFIF in China was reviewed; the effects of RFIF on increasing farmer' income and enhancing agricultural efficiency were clarified. The technologies matched with RFIF,such as rice paddy engineering technology,safe plant protection technology,security fertilization technology,fish disease prevention and control technology and water quality management technology,were summarized,and the supporting role of RFIF for agriculture was pointed out. In addition,the development prospect of RFIF was proposed,as well as the key research direction of RFIF. | Shunlong MENG Gengdong HU DANDan LI Liping QIU Chao SONG Limin FAN Yao ZHENG Wei WU Jiazhang CHEN Xuwen BING | 2018 | Agricultural Biotechnology2018，7，4： | 2 |
| 12 | Investigation on the effect of filling ratio on the steady-state heat transfer performance of a vertical two-phase closed thermosyphon显示文摘 | JIAO Bo QIU Limin ZHANG Xiaobin | 2008 | Applied Thermal Engineering2008，28，1112： | 1 |
| 13 | Fertilizer recommendation for maize in China based on yield response and agronomic efficiency显示文摘 | Xinpeng Xu Ping He Mirasol F. Pampolino Adrian M. Johnston Shaojun Qiu Shicheng Zhao Limin Chuan Wei Zhou | 2014 | Field Crops Research2014，，： | 1 |
| 14 | Investigation on Traveling Wave Thermoacoustic Heat Engine with High Pressure Amplitude显示文摘 | Sun Daming Qiu Limin ZhangWu | 2005 | Energy Conversion and Management2005，46，2： | 1 |
| 15 | Nutrient requirements for maize in China based on QUEFTS analysis显示文摘 | Xinpeng Xu Ping He Mirasol F. Pampolino Limin Chuan Adrian M. Johnston Shaojun Qiu Shicheng Zhao Wei Zhou | 2013 | Field Crops Research2013，，： | 1 |
| 16 | Estimating nutrient uptake requirements for wheat in China显示文摘 | Limin Chuan Ping He Jiyun Jin Shutian Li Cynthia Grant Xinpeng Xu Shaojun Qiu Shicheng Zhao Wei Zhou | 2013 | Field Crops Research2013，，： | 1 |
| 17 | Effect of Pressure Disturbance on Onset Processes in Thermoacoustic Engine 显示文摘 | QIU Limin SUN Darning TAN Yongxiang | 2006 | Energy Conversion and Management2006，47，1112： | 1 |
| 18 | Immunological characteristics of human umbilical cord mesenchymal stemcells and the therapeutic effects of their transplantion on hyperglycemia in diabeticrats显示文摘 | Hongwu Wang Xiaoyan Qiu Ping Ni Xuerong Qiu Xiaobo Lin Weizhao Wu Lichun Xie Limin Lin Juan Min Xiulan Lai Yunbin Chen Guyu Ho Lian Ma | 2014 | International Journal of Molecular Medicine2014，，2： | 1 |
| 19 | Immunological characteristics of human umbilical cord mesenchymal stemcells and the therapeutic effects of their transplantion on hyperglycemia in diabeticrats显示文摘 | Hongwu Wang Xiaoyan Qiu Ping Ni Xuerong Qiu Xiaobo Lin Weizhao Wu Lichun Xie Limin Lin Juan Min Xiulan Lai Yunbin Chen Guyu Ho Lian Ma | 2014 | International Journal of Molecular Medicine2014，，2： | 1 |
| 20 | Valve Timing Effect on the Cooling Performance of a 4 K Pulse Tube Cooer 显示文摘 | QIU Limin Thummes G | 2002 | Cryogenics2002，42，： | 1 |
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