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Tailoring Anisotropy and Heterogeneity of Selective Laser Melted Ti6Al4V Alloys 选择性激光熔化Ti6Al4V合金的剪裁各向异性和非均质性
J. Karimi, L. Kollo, K. Prashanth
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引用次数: 1
Effect of Longitudinal and Lateral Holes on the Performance of an Elliptical Pin Fin Heat Exchanger 纵向孔和侧向孔对椭圆针翅式换热器性能的影响
Monoj Baruah, K. Kalita
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引用次数: 0
Hydrogen Storage Performance of C14 Type Ti0.24V0.17Zr0.17Mn0.17Co0.17Fe0.08 High Entropy Intermetallics C14型Ti0.24V0.17Zr0.17Mn0.17Co0.17Fe0.08高熵金属间化合物的储氢性能
Abhishek Kumar, T. Yadav, M. Shaz, N. Mukhopadhyay
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引用次数: 3
Numerical Study on NO_x Emissions from Jet A–Air Detonations 射流a -空气爆炸NO_x排放数值研究
M. Iyer, A. Dahake, Ranjay Singh, Ashutosh Kumar Singh
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引用次数: 1
A Novel Islanding Detection Method in a Distributed Generation Using Change in Phase Angle Difference Between Positive Sequence Current and Voltage 基于正序电流与电压相位角差变化的分布式电源孤岛检测方法
Javeed Bashir, P. Jena
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引用次数: 1
Effect of Internal Heat Generation on Mixed Convection Flow from a Vertical Plate to a Fluid with Nonlinear Thermal Radiation 内部生热对垂直板向非线性热辐射流体混合对流流动的影响
B. Jha, Gabriel Samaila
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引用次数: 0
Efficacy of Curcumin–Surfactant Complex Towards Stabilisation of Emulsions 姜黄素-表面活性剂复合物对乳剂稳定性的影响
Mandar P. Badve, Manasi Pimpalkar
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引用次数: 0
Improving Indoor Air Ventilation by a Ceiling Fan to Mitigate Aerosols Transmission. 利用吊扇改善室内通风,减少气溶胶的传播。
Pub Date : 2023-01-01 Epub Date: 2023-01-31 DOI: 10.1007/s41403-023-00387-x
Santosh Ramagya Mallah, Sachidananda Behera, Atul Sharma, Amit Agrawal, Rajneesh Bhardwaj

Improving air flow and ventilation in an indoor environment is central to mitigating the airborne transmission of aerosols. Examples include, COVID-19 or similar diseases that transmit by airborne aerosols or respiratory droplets. While there are standard guidelines for enhancing the ventilation of space, the effect of a ceiling fan on the ventilation has not been explored. Such an intervention could be critical, especially in a resource-limited setting. In the present work, we numerically study the effect of a rotating ceiling fan on indoor air ventilation using computational fluid dynamics (CFD) simulations. In particular, we employ RANS turbulence model and compare the computed flow fields for a stationary and rotating fan in an office room with a door and window. While a re-circulation zone spans the whole space for the stationary fan, stronger re-circulation zones and small stagnation zones appear in the flow-field inside the room for the case of a rotating fan. The re-circulation zones help bring in fresh air through the window and remove stale air through the door, thereby improving the ventilation rate by one order of magnitude. We briefly discuss the chances of infection by aerosols via flow-fields corresponding to stationary and rotating fans.

Graphical abstract:

改善室内环境的空气流动和通风是减少气溶胶空气传播的关键。例如,COVID-19 或通过空气传播的气溶胶或呼吸道飞沫传播的类似疾病。虽然有加强空间通风的标准指南,但吊扇对通风的影响还没有进行过研究。这种干预措施可能至关重要,尤其是在资源有限的环境中。在本研究中,我们利用计算流体动力学(CFD)模拟对旋转吊扇对室内空气通风的影响进行了数值研究。特别是,我们采用了 RANS 湍流模型,并比较了在有门窗的办公室内固定风扇和旋转风扇的计算流场。静止风扇的再循环区横跨整个空间,而旋转风扇的房间内流场则出现了较强的再循环区和较小的停滞区。再循环区有助于通过窗户引入新鲜空气,通过门排出陈腐空气,从而将通风率提高一个数量级。我们简要讨论了气溶胶通过静止风扇和旋转风扇对应的流场进行感染的几率:
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引用次数: 0
Effectiveness of N95 Mask in Preventing COVID-19 Transmission. N95口罩预防COVID-19传播的有效性
Yagya Narayan, Sanghamitro Chatterjee, Amit Agrawal, Rajneesh Bhardwaj

N95 mask has emerged as a potential measure to mitigate the airborne transmission of respiratory disease such as COVID-19. Herein, we experimentally investigated the impact and interaction of pure water droplets as surrogate to respiratory droplets with the different layers of a commercially available N95 mask to demonstrate the penetration and passage-capability of respiratory fluids through the different layers. The penetration of an impacting droplet through the mask layers was characterized by elucidating the ejection of secondary droplets from the rear-side surface of the target mask material. In addition, the passage of respiratory fluids through the mask layers was characterized by capillary imbibition of the droplet liquid through the pores, as a function of wettability of the mask material. Droplet impact at Weber numbers We = 208 and 416 has been considered in the present study; the chosen We range corresponds to that of cough droplets realized in real respiratory events. Each layer of the N95 mask is hydrophobic that prevents capillary imbibition through the pores: a sessile droplet placed over the surface exhibits classical diffusion-limited evaporation. Droplet impact experiments on N95 mask layer surfaces reveal that a single layer allows liquid penetration at We = 416; while a combination of five layers, as is the case of a commercially available N95 mask, blocks the penetration completely, consistent with the widely known effectiveness of N95 masks. Herein, we devote special attention to compare the so-obtained efficiency of N95 masks to that of a recently designed two-layer cloth mask containing an intermediate High-Efficiency Particulate Air (HEPA) filter layer (Narayan et al. in Phys Fluids 34:061703, 2022). We conclusively show that the performance of the designed cloth mask is identical to that of a commercially available N95 mask. The assessment of mask effectiveness further includes examination of breathability and comfort by means of passage of air through them. A comparative study has been presented herein for a clear demonstration of effectiveness of different masks in preventing air-borne transmission of COVID-19.

N95口罩已成为缓解COVID-19等呼吸系统疾病在空气中传播的潜在措施。在此,我们通过实验研究了纯水水滴作为替代品与市售N95口罩不同层的呼吸液滴的影响和相互作用,以证明呼吸道液体通过不同层的渗透和通过能力。通过阐明从目标掩膜材料背面喷射出的二次液滴,表征了冲击液滴穿透掩膜层的过程。此外,呼吸道液体通过面罩层的特征是液滴液体通过毛孔的毛细吸吮,这是面罩材料润湿性的函数。本研究考虑了韦伯数We = 208和416时液滴的撞击;所选We范围与实际呼吸事件中实现的咳嗽飞沫的We范围相对应。N95口罩的每一层都是疏水性的,可以防止毛细血管通过毛孔的吸吮:放置在表面上的无根液滴表现出经典的扩散限制蒸发。液滴对N95掩膜层表面的冲击实验表明,在We = 416时,单层允许液体穿透;而市面上可买到的N95口罩由五层组成,完全阻挡了病毒的渗透,这与众所周知的N95口罩的有效性一致。在此,我们特别关注将N95口罩的效率与最近设计的含有中间高效微粒空气(HEPA)过滤层的双层布口罩的效率进行比较(Narayan et al. in Phys fluid 34:061703, 2022)。我们最终表明,设计的布口罩的性能与市售的N95口罩相同。对口罩有效性的评估还包括检查空气通过口罩的透气性和舒适度。本文通过对比研究,清楚地展示了不同口罩在预防COVID-19空气传播中的有效性。
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引用次数: 1
Smart Intensity Control in Surgical Lights for Efficient Shadow Reduction Using Ultrasonic Sensor 超声传感器在手术灯中有效减少阴影的智能强度控制
Adityapratap Singh, D. J. Pete
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引用次数: 0
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Transactions of the Indian National Academy of Engineering : an international journal of engineering and technology
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