This research comprehensively investigates the flow and thermal characteristics of a pulsating impinging jet over a dimpled surface.It analyzes the impact of key parameters(e.g.,inlet velocity pulsation functions,puls...This research comprehensively investigates the flow and thermal characteristics of a pulsating impinging jet over a dimpled surface.It analyzes the impact of key parameters(e.g.,inlet velocity pulsation functions,pulsation frequency,amplitude,dimple pitch,dimple depth,Reynolds number)on flow patterns and heat transfer.Validated computational fluid dynamics and the Re-normalization group turbulence model are employed to accurately simulate complex turbulent flow behavior.Local and average heat transfer coefficients are calculated and compared to steady impingement cases,revealing the potential benefits of pulsation for heat transfer enhancement.The study also examines how pulsation-induced flow modulation and thermal mixing affect heat transfer mechanisms.Results indicate that combining fluctuating flow with a dimpled surface can improve heat transfer rates.In summary,increasing pulsation amplitude consistently enhances heat transfer,while the effect of frequency varies between impinging and wall jet zones.展开更多
The article analyzes the problems of introducing electric vehicles,as well as their difference from cars with internal combustion engines.This type of transport has long been included in our everyday life.Today,in the...The article analyzes the problems of introducing electric vehicles,as well as their difference from cars with internal combustion engines.This type of transport has long been included in our everyday life.Today,in the era of the heyday of technology,a person understands that cars with an internal combustion engine(ICE)are almost on the edge of their existence.At present,the development of the production of electric vehicles should be considered as a promising direction of the Iranian automobile industry.At the moment,this market in Iran is not yet occupied by foreign companies,and therefore national companies have a chance to use the strategy of“growth together with the market”.展开更多
文摘This research comprehensively investigates the flow and thermal characteristics of a pulsating impinging jet over a dimpled surface.It analyzes the impact of key parameters(e.g.,inlet velocity pulsation functions,pulsation frequency,amplitude,dimple pitch,dimple depth,Reynolds number)on flow patterns and heat transfer.Validated computational fluid dynamics and the Re-normalization group turbulence model are employed to accurately simulate complex turbulent flow behavior.Local and average heat transfer coefficients are calculated and compared to steady impingement cases,revealing the potential benefits of pulsation for heat transfer enhancement.The study also examines how pulsation-induced flow modulation and thermal mixing affect heat transfer mechanisms.Results indicate that combining fluctuating flow with a dimpled surface can improve heat transfer rates.In summary,increasing pulsation amplitude consistently enhances heat transfer,while the effect of frequency varies between impinging and wall jet zones.
文摘The article analyzes the problems of introducing electric vehicles,as well as their difference from cars with internal combustion engines.This type of transport has long been included in our everyday life.Today,in the era of the heyday of technology,a person understands that cars with an internal combustion engine(ICE)are almost on the edge of their existence.At present,the development of the production of electric vehicles should be considered as a promising direction of the Iranian automobile industry.At the moment,this market in Iran is not yet occupied by foreign companies,and therefore national companies have a chance to use the strategy of“growth together with the market”.
