Although confined swirling jets are typically used in many practical applications, a detailed inv... more Although confined swirling jets are typically used in many practical applications, a detailed investigation in the literature is, however, very limited. As such, this paper investigates the fundamental thermofluidic behaviors of swirling impinging jets due to flow confinements at small impingement distance. In this regard, turbulent flow simulations with an ambient air jet are carried out using RANS approach, whereby turbulence is governed by SST k-ω model. Inlet boundary conditions are applied from the CTA anemometer derived experimental data for the same nozzle geometry in order for a realistic analysis. The flow dynamics and heat transfer between a swirling jet and the impingement plate are studied for a Reynolds number (Re) equals to 11,600 and Swirl numbers (S) from 0 to 0.74 for an impingement distance equals to 0.5 nozzle diameter. The results show that a strong flow recirculation zone appears between the nozzle and the surface, even for non-swirling jets. For highly swirling jets, another secondary recirculation zone exists around the central axis near the stagnation point. The surface static pressure distribution is found to be negative due to flow confinement for all swirl conditions. The degree of swirl intensity and the associated flow recirculation also largely affect heat transfer behaviors on the impingement surface.Although confined swirling jets are typically used in many practical applications, a detailed investigation in the literature is, however, very limited. As such, this paper investigates the fundamental thermofluidic behaviors of swirling impinging jets due to flow confinements at small impingement distance. In this regard, turbulent flow simulations with an ambient air jet are carried out using RANS approach, whereby turbulence is governed by SST k-ω model. Inlet boundary conditions are applied from the CTA anemometer derived experimental data for the same nozzle geometry in order for a realistic analysis. The flow dynamics and heat transfer between a swirling jet and the impingement plate are studied for a Reynolds number (Re) equals to 11,600 and Swirl numbers (S) from 0 to 0.74 for an impingement distance equals to 0.5 nozzle diameter. The results show that a strong flow recirculation zone appears between the nozzle and the surface, even for non-swirling jets. For highly swirling jets, another secondar...
Advancement in electricity is the key ingredient that can actively take part in alleviating pover... more Advancement in electricity is the key ingredient that can actively take part in alleviating poverty and drastically improve the socio-economic status of the people of Bangladesh. The incorporation of renewable energy sources would help the country meet the energy requirement as well as contribute positively towards building a sustainable planet. The paper has extensively discussed the potential aspects of renewable energy resources in Bangladesh and how the Internet of Things can facilitate the implementation of intermittent sources. The regulatory and socio-economic aspects of the renewable energy industry have been explored and sustainable solutions will be discussed to fast-track the process of integrating various renewable energy sources in the power grid to meet the energy demand. The paper discusses the challenges associated with the RE integration in Bangladesh’s power mix and tries to mitigate it through the IoT. Besides that, an RE map for Bangladesh along with prospective ...
Although confined swirling jets are typically used in many practical applications, a detailed inv... more Although confined swirling jets are typically used in many practical applications, a detailed investigation in the literature is, however, very limited. As such, this paper investigates the fundamental thermofluidic behaviors of swirling impinging jets due to flow confinements at small impingement distance. In this regard, turbulent flow simulations with an ambient air jet are carried out using RANS approach, whereby turbulence is governed by SST k-ω model. Inlet boundary conditions are applied from the CTA anemometer derived experimental data for the same nozzle geometry in order for a realistic analysis. The flow dynamics and heat transfer between a swirling jet and the impingement plate are studied for a Reynolds number (Re) equals to 11,600 and Swirl numbers (S) from 0 to 0.74 for an impingement distance equals to 0.5 nozzle diameter. The results show that a strong flow recirculation zone appears between the nozzle and the surface, even for non-swirling jets. For highly swirling jets, another secondary recirculation zone exists around the central axis near the stagnation point. The surface static pressure distribution is found to be negative due to flow confinement for all swirl conditions. The degree of swirl intensity and the associated flow recirculation also largely affect heat transfer behaviors on the impingement surface.Although confined swirling jets are typically used in many practical applications, a detailed investigation in the literature is, however, very limited. As such, this paper investigates the fundamental thermofluidic behaviors of swirling impinging jets due to flow confinements at small impingement distance. In this regard, turbulent flow simulations with an ambient air jet are carried out using RANS approach, whereby turbulence is governed by SST k-ω model. Inlet boundary conditions are applied from the CTA anemometer derived experimental data for the same nozzle geometry in order for a realistic analysis. The flow dynamics and heat transfer between a swirling jet and the impingement plate are studied for a Reynolds number (Re) equals to 11,600 and Swirl numbers (S) from 0 to 0.74 for an impingement distance equals to 0.5 nozzle diameter. The results show that a strong flow recirculation zone appears between the nozzle and the surface, even for non-swirling jets. For highly swirling jets, another secondar...
Advancement in electricity is the key ingredient that can actively take part in alleviating pover... more Advancement in electricity is the key ingredient that can actively take part in alleviating poverty and drastically improve the socio-economic status of the people of Bangladesh. The incorporation of renewable energy sources would help the country meet the energy requirement as well as contribute positively towards building a sustainable planet. The paper has extensively discussed the potential aspects of renewable energy resources in Bangladesh and how the Internet of Things can facilitate the implementation of intermittent sources. The regulatory and socio-economic aspects of the renewable energy industry have been explored and sustainable solutions will be discussed to fast-track the process of integrating various renewable energy sources in the power grid to meet the energy demand. The paper discusses the challenges associated with the RE integration in Bangladesh’s power mix and tries to mitigate it through the IoT. Besides that, an RE map for Bangladesh along with prospective ...
Uploads
Papers by Sumaiya Tasnim