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| 1 | Impact of different human walking patterns on flow and contaminant dispersion in residential kitchens:Dynamic simulation study显示文摘The effects of different human walking patterns on contaminant dispersion in residential kitchens were investigated through computational fluid dynamics simulation with the dynamic mesh method.A tracer gas experiment was performed to verify the feasibility and accuracy of the simulation method.Flow characteristics induced by human walking were minutely described,and the transient capture efficiency of the range hood was adopted to assess the impact of human walking quantitatively.Human walking parallel to a counter,human walking parallel to a counter manned by another human,and human walking toward a counter were studied.Results showed that the mutual effect of the wake and thermal plume caused contaminant dispersion and decreased the performance of the range hood as the human subject walked beside the counter.Even a standing person operated ahead the counter,the wake would affect the thermal plume in a certain extent.The decrement of capture efficiency approached 0.5 in the most unfavorable situation.Moreover,the coaction of the positive/negative pressure zone and impinging air jet drew the thermal plume to the human body.The fluctuation of capture efficiency in this condition was moderate relative to that for the human walking pattern beside the counter.This research could provide a comprehensive overview of different human walking patterns and their impact on residential kitchens and thereby facilitate the maintenance of kitchen air quality. | Lipeng Lv Yuhang Wu Changsheng Cao Lingjie Zeng Jun Gao Wuhao Xie Jing Zhang | 2022 | Building Simulation2022，15，6： | 1 |
| 2 | Direct capture efficiency of range hoods in the confined kitchen space显示文摘Range hood is a local ventilation device applied widely in residential kitchen for maintaining healthy environment. This study firstly defines the direct capture efficiency (DCE) based on the two-zone model in a confined kitchen space. A mass flux ratio of the secondary captured pollutant to the entrained pollutant from the room zone is proposed for the determination of DCE, where the distribution coefficient is firstly solved, and then its sensitivity analysis on the DCE is carried out. To validate the mass flux ratio and concisely identify the DCE, a virtual purification method that artificially sets the escaped pollutant to zero, is further applied. Compared with the newly developed DCE, the existing indexes, such as contaminant removal efficiency (CRE), total capture efficiency (TCE), fail to differentiate the direct capture from the total capture. Finally, the effects of such factors as makeup airflow pattern, exhaust flow rate, cooking source temperature and the individual occupied/unoccupied on the DCE are fully studied. It is confirmed that different makeup airflow pattern results in distinguished airflow distribution, which makes a significant difference of more than 30% in DCE. Over 50% increase of DCE can be achieved when the exhaust flow rate is increased from 300 to 600 m3/h. About 30% decrease of DCE is observed with the increased cooking source temperature from 100 to 300 °C, and 10% increase of DCE is appeared in the individual occupied case. This reasonable definition and determination of DCE would help to improve the real capture performance of range hoods. | Changsheng Cao Wuhao Xie Yunfei Xia Jun Gao | 2022 | Building Simulation2022，15，10： | 0 |
| 3 | New Cage-Like Cerium Trihydride Stabilized at Ambient Conditions显示文摘Metal hydrides,generally formed by high pressure combined with high-temperature conditions,have attracted substantial interest due to their promising high-energy density and high-temperature superconductivity.Although the synthesis and properties of these hydrides have been extensively studied,an important challenge is the lack of an efficient method to retain high-pressure phases.Herein,we have successfully quenched a high-pressure phase to ambient conditions with the precise control of different compression pathways.A newβ-CeH_(3) phase(space group Pm3n)isostructural toβ-UH_(3) phase was synthesized by the reaction of Ce and H2 above 33.0 GPa in a laser-heated diamond anvil cell.Theβ-CeH_(3)phase has a cage-like framework structure that can be retained at ambient conditions.The electrical resistance as a function of temperature determines its metallic properties,but no superconductivity is observed in the current temperature range.Thermodynamic and dynamic calculations further prove the stability ofβ-CeH_(3) at ambient pressure.This work demonstrates that different synthesized paths will drive the formation of different products. | Xin Li Xiaoli Huang Wuhao Chen Di Zhou Hui Xie Quan Zhuang Defang Duan Tian Cui | 2022 | CCS Chemistry2022，4，3： | 0 |
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