BACKGROUND While existing literature on ischiofemoral impingement syndrome(IFI)predominantly emphasizes surgical interventions or generalized physical therapy approaches,there remains a paucity of evidence regarding s...BACKGROUND While existing literature on ischiofemoral impingement syndrome(IFI)predominantly emphasizes surgical interventions or generalized physical therapy approaches,there remains a paucity of evidence regarding structured,multimodal rehabilitation programs targeting biomechanical deficits in IFI.This case report evaluates the efficacy of a multimodal rehabilitation program addressing a critical gap in conservative management strategies.CASE SUMMARY The patient underwent comprehensive physical and clinical examination,including hip X-ray and magnetic resonance imaging investigations.The patient completed the Musculoskeletal Health Questionnaire(MSK-HQ)and numerical pain rating scale(NPRS).The patient underwent a two-month tailored structured physical therapy intervention and repeated the same assessment afterwards.The patient's substantial reduction in pain,reflected by a significant decrease in the patient’s NPRS score from 9 to 3 points,signifies a positive clinical response.This outcome,coupled with the significant improvement in the patient's health-related quality of life according to the MSK-HQ score,which increased from 12 to 48 points,underscores the success of our research.CONCLUSION The study highlights the importance of a comprehensive approach to diagnosing and managing IFI,combining clinical assessment with imaging and implementing a multimodal rehabilitation program for optimal outcomes.展开更多
This commentary evaluates the case report by Mohammed et al on conservative management of ischiofemoral impingement through a multimodal physical therapy program integrating in-person sessions,telerehabilitation,dry n...This commentary evaluates the case report by Mohammed et al on conservative management of ischiofemoral impingement through a multimodal physical therapy program integrating in-person sessions,telerehabilitation,dry needling,and kinesiology taping.The study demonstrated significant pain reduction and functional improvement,highlighting the feasibility of hybrid care models.However,limitations include short-term follow-up,lack of post-treatment imaging,and single-case design restricting generalizability.Future research should prioritize longitudinal studies,anatomical correlation via imaging,and randomized trials to validate efficacy across diverse populations.While the framework offers promising clinical utility,further investigation is critical to optimize protocols and elucidate biomechanical mechanisms underlying symptom resolution.展开更多
With the acceleration of industrialization and urbanization,ammonia nitrogen pollution in water bodies has become increasingly severe,making the development of efficient and low-consumption wastewater treatment tech-n...With the acceleration of industrialization and urbanization,ammonia nitrogen pollution in water bodies has become increasingly severe,making the development of efficient and low-consumption wastewater treatment tech-nologies highly significant.This study employs three-dimensional computational fluid dynamics(CFD)to investigate the cavitation mechanisms and flow field characteristics in a novel jet impingement-negative pressure ammonia removal reactor.The simulation,validated by experimental pressure data with a high degree of consistency,utilizes the Mixture model,the Realizable k-εturbulence model,and the Schnerr-Sauer cavitation model.The results demonstrate that the flow velocity undergoes a substantial acceleration within the orifice nozzle,triggering a dramatic pressure drop from an inlet value of approximately 1.17 MPa to below the saturated vapor pressure,reaching as low as−109 kPa,which induces intense cavitation.Cavitation bubbles primarily originate on the inner wall of the nozzle,with the vapor volume fraction peaking at about 0.42 within the orifice.A strong positive correlation was observed between the local vapor fraction and the flow velocity,indicating that cavitation enhances jet intensity.Furthermore,vortex structures near the wall and within the jacket sustain low-pressure zones,facilitating continuous cavitation and efficient mixing.This study quantitatively elucidates the cavitation dynamics and its interplay with the flow field,providing a solid theoretical and numerical basis for optimizing the reactor design to enhance ammonia removal efficiency.展开更多
This numerical simulation investigates the two⁃phase flow under the condition of supercooled large droplets impinging on the aircraft surface.Based on Eulerian framework,a method for calculating supercooled water drop...This numerical simulation investigates the two⁃phase flow under the condition of supercooled large droplets impinging on the aircraft surface.Based on Eulerian framework,a method for calculating supercooled water droplet impingement characteristics is established.Then,considering the deformation and breaking effects during the movement,this method is extended to calculate the impingement characteristics of supercooled large droplets,as well as the bouncing and splashing effects during impingement.The impingement characteristics of supercooled large droplets is then investigated by this method.The results demonstrate that the deformation and breaking effects of supercooled large droplets have negligible influence on the impingement characteristics under the experimental conditions of this paper.In addition,the results of the impingement range and collection efficiency decrease when considering the bouncing and splashing effects.The bouncing effect mainly affects the mass loss near the impingement limits,while the splashing effect influences the result around the stagnation point.This investigation is beneficial for the analysis of aircraft icing and the design of anti⁃icing system with supercooled large droplet conditions.展开更多
Transient heat transfer has been experimentally investigated for subcooled water jet impingement quenching of a hot rotating stainless steel cylinder. Temperatures beneath the impinged surface were measured during que...Transient heat transfer has been experimentally investigated for subcooled water jet impingement quenching of a hot rotating stainless steel cylinder. Temperatures beneath the impinged surface were measured during quenching and used to estimate surface temperature and surface heat flux by using a developed numerical inverse solution of heat conduction. Heat flux reached its maximum value just after the WF （wetting front） （visible leading edge of boiling region） started moving from stagnation towards the circumferential region. WF moved in a non-uniform manner in angular direction on the hot rotating surface. With the increase of surface velocity, heat flux decreased. Higher surface velocity moved away the produced vapor bubbles and reduced the solid-liquid contact time which made it one-dimensional heat conduction from multi-dimensional, that reduced heat flux. The generated boiling curve from the estimated heat flux showed a reasonable agreement with existing studies. The surface maximum heat flux （maximum value in each cycle） distribution trend with radial position is entirely comparable with the static surface critical heat flux in literature. An explosive to a sheet like flow patterns were observed with the decrease of surface temperature. The flow patterns were followed by the intensity of sound during quenching.展开更多
Three-dimensional numerical simulation is carried out to investigate the flow and heat transfer characteristics of impingement/effusion cooling systems. The impingement/effusion holes are arranged on two parallel perf...Three-dimensional numerical simulation is carried out to investigate the flow and heat transfer characteristics of impingement/effusion cooling systems. The impingement/effusion holes are arranged on two parallel perforated plates respectively in a staggered manner. Every effusion hole has an inclined angle of 30° with respect to the surface. The two parallel plates are spaced three times the diameter of the effusion hole. The ratio of center-to-center spacing of adjacent holes to the diameter of the effusion hole is set to be 3.0, 4.0 and 5.0 respectively. The flow field, temperature field and wall film cooling effectiveness are calculated for different blowing ratios ranging from 0.5 to 1.5. In general, the wall cooling effectiveness increases as the center-to-center spacing of adjacent holes decreases or the blowing ratio increases.展开更多
文摘BACKGROUND While existing literature on ischiofemoral impingement syndrome(IFI)predominantly emphasizes surgical interventions or generalized physical therapy approaches,there remains a paucity of evidence regarding structured,multimodal rehabilitation programs targeting biomechanical deficits in IFI.This case report evaluates the efficacy of a multimodal rehabilitation program addressing a critical gap in conservative management strategies.CASE SUMMARY The patient underwent comprehensive physical and clinical examination,including hip X-ray and magnetic resonance imaging investigations.The patient completed the Musculoskeletal Health Questionnaire(MSK-HQ)and numerical pain rating scale(NPRS).The patient underwent a two-month tailored structured physical therapy intervention and repeated the same assessment afterwards.The patient's substantial reduction in pain,reflected by a significant decrease in the patient’s NPRS score from 9 to 3 points,signifies a positive clinical response.This outcome,coupled with the significant improvement in the patient's health-related quality of life according to the MSK-HQ score,which increased from 12 to 48 points,underscores the success of our research.CONCLUSION The study highlights the importance of a comprehensive approach to diagnosing and managing IFI,combining clinical assessment with imaging and implementing a multimodal rehabilitation program for optimal outcomes.
文摘This commentary evaluates the case report by Mohammed et al on conservative management of ischiofemoral impingement through a multimodal physical therapy program integrating in-person sessions,telerehabilitation,dry needling,and kinesiology taping.The study demonstrated significant pain reduction and functional improvement,highlighting the feasibility of hybrid care models.However,limitations include short-term follow-up,lack of post-treatment imaging,and single-case design restricting generalizability.Future research should prioritize longitudinal studies,anatomical correlation via imaging,and randomized trials to validate efficacy across diverse populations.While the framework offers promising clinical utility,further investigation is critical to optimize protocols and elucidate biomechanical mechanisms underlying symptom resolution.
基金supported by Chongqing Natural Science Foundation Innovation and Development Joint Fund(CSTB2023NSCQ-LZX0095)Chongqing Natural Science Foundation General Project(CSTB2025NSCQ-GPX0955)+3 种基金Science and Technology Research Program of Chongqing Municipal Education Commission of China(KJQN202401157)The Open and Innovation Fund of Hubei Three Gorges Laboratory(SK250005)The Key Laboratory of Manufacturing and Application of Intelligent Well Control for Oil and Gas Production and Transportation of Luzhou(2024LZOGB-05)postgraduate Innovation Project of Chongqing University of Technology(CYS240709).
文摘With the acceleration of industrialization and urbanization,ammonia nitrogen pollution in water bodies has become increasingly severe,making the development of efficient and low-consumption wastewater treatment tech-nologies highly significant.This study employs three-dimensional computational fluid dynamics(CFD)to investigate the cavitation mechanisms and flow field characteristics in a novel jet impingement-negative pressure ammonia removal reactor.The simulation,validated by experimental pressure data with a high degree of consistency,utilizes the Mixture model,the Realizable k-εturbulence model,and the Schnerr-Sauer cavitation model.The results demonstrate that the flow velocity undergoes a substantial acceleration within the orifice nozzle,triggering a dramatic pressure drop from an inlet value of approximately 1.17 MPa to below the saturated vapor pressure,reaching as low as−109 kPa,which induces intense cavitation.Cavitation bubbles primarily originate on the inner wall of the nozzle,with the vapor volume fraction peaking at about 0.42 within the orifice.A strong positive correlation was observed between the local vapor fraction and the flow velocity,indicating that cavitation enhances jet intensity.Furthermore,vortex structures near the wall and within the jacket sustain low-pressure zones,facilitating continuous cavitation and efficient mixing.This study quantitatively elucidates the cavitation dynamics and its interplay with the flow field,providing a solid theoretical and numerical basis for optimizing the reactor design to enhance ammonia removal efficiency.
基金supported in part by the National Natural Science Foundation of China(No.51806008)the Open Fund of Key Laboratory of Rotor Aerodynamics Key Laboratory(No.RAL202104-2)。
文摘This numerical simulation investigates the two⁃phase flow under the condition of supercooled large droplets impinging on the aircraft surface.Based on Eulerian framework,a method for calculating supercooled water droplet impingement characteristics is established.Then,considering the deformation and breaking effects during the movement,this method is extended to calculate the impingement characteristics of supercooled large droplets,as well as the bouncing and splashing effects during impingement.The impingement characteristics of supercooled large droplets is then investigated by this method.The results demonstrate that the deformation and breaking effects of supercooled large droplets have negligible influence on the impingement characteristics under the experimental conditions of this paper.In addition,the results of the impingement range and collection efficiency decrease when considering the bouncing and splashing effects.The bouncing effect mainly affects the mass loss near the impingement limits,while the splashing effect influences the result around the stagnation point.This investigation is beneficial for the analysis of aircraft icing and the design of anti⁃icing system with supercooled large droplet conditions.
文摘Transient heat transfer has been experimentally investigated for subcooled water jet impingement quenching of a hot rotating stainless steel cylinder. Temperatures beneath the impinged surface were measured during quenching and used to estimate surface temperature and surface heat flux by using a developed numerical inverse solution of heat conduction. Heat flux reached its maximum value just after the WF （wetting front） （visible leading edge of boiling region） started moving from stagnation towards the circumferential region. WF moved in a non-uniform manner in angular direction on the hot rotating surface. With the increase of surface velocity, heat flux decreased. Higher surface velocity moved away the produced vapor bubbles and reduced the solid-liquid contact time which made it one-dimensional heat conduction from multi-dimensional, that reduced heat flux. The generated boiling curve from the estimated heat flux showed a reasonable agreement with existing studies. The surface maximum heat flux （maximum value in each cycle） distribution trend with radial position is entirely comparable with the static surface critical heat flux in literature. An explosive to a sheet like flow patterns were observed with the decrease of surface temperature. The flow patterns were followed by the intensity of sound during quenching.
基金National Natural Science Foundation of China (50876041)Aeronautical Science Foundation of China (2008ZB2014)
文摘Three-dimensional numerical simulation is carried out to investigate the flow and heat transfer characteristics of impingement/effusion cooling systems. The impingement/effusion holes are arranged on two parallel perforated plates respectively in a staggered manner. Every effusion hole has an inclined angle of 30° with respect to the surface. The two parallel plates are spaced three times the diameter of the effusion hole. The ratio of center-to-center spacing of adjacent holes to the diameter of the effusion hole is set to be 3.0, 4.0 and 5.0 respectively. The flow field, temperature field and wall film cooling effectiveness are calculated for different blowing ratios ranging from 0.5 to 1.5. In general, the wall cooling effectiveness increases as the center-to-center spacing of adjacent holes decreases or the blowing ratio increases.
