![]() ![]() ![]() The flow of fluid is transient and the problem is investigated by analyzing the contours of pressure, wall shear, particle residence time.Īlhamid et al. The pressure velocity decoupling is avoided using simple algorithm and the turbulence is modelled using K-epsilon turbulence model and the geometry is meshed using tetrahedral mesh. The problem is solved using Ansys Fluent 19.0 software and the governing equations are solved by using finite volume method. ![]() This mixed-mode ventilation is very helpful for the health care workers and this model is very flexible as it does not require much electricity the natural vent is placed in the wind direction and when the natural ventilation is not available then the size and number of exhaust fans can be increased to ensure the required ventilation rate and this should be checked before fixing the setup, however, this mixed-mode ventilation setup should be used with care and monitoring should be done at regular intervals to maintain the air quality. As we all know air naturally flows from a high-pressure area to low-pressure areas by apply and directly hits the patient's chest and then leave through the exhaust by collecting the contaminated particles without spreading into the room and then the exhaust air is sent through the HEPA filters into the atmosphere so, that nearly 96% of the particles are trapped. To this, we have designed a negative pressure room such that the air entered the room directly reaches the patient and leaves through an exhaust duct placed behind the patient. As there is an aerosol transmission the person who treats the covid patients (health care workers) must be taking at most care and by this research, we hope that we can bring a small change in the negative pressure room to avoid the spread of the particles into the room. The important measures and precautions to be taken by wearing the Mask, cleaning hands frequently. within a 1.5-m range with an infected person can catch the COVID-19 when the droplets get into the mouth or nose. Usually, people who are in close contact i.e. we need to maintain social distancing to avoid the spread. The current scenario suggests that COVID-19 spreads rapidly from person to person through direct or indirect contact with contaminated surfaces. Computational fluid dynamics (CFD) plays an important role in designing these kinds of rooms by using different boundary conditions and choosing the different locations of the vents for getting accurate results. All these rooms are negative pressure rooms such that those tiny particles don't spread across those rooms to the surroundings and are moved out of exhaust through HEPA filters. When an infected person sneezes or coughs all those tiny particles are spread across the surroundings and when these particles are inhaled by the other person, he might be infected. Many hospitals use Isolation rooms for treating patients suffering from various diseases like TB, SARS, and the current COVID-19. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. It was identified that the mixed mode ventilation system is more effective in controlling the spread of virus droplets inside the room The Computational fluid dynamics simulations are performed to investigate the diffusion of airbone virus inside a negative pressure room with mixed mode ventilation system. These negative pressure rooms prevent the spread of the contaminated particles to the surroundings and by creating a negative pressure in the room whenever the door is opened the atmospheric air is sucked in and not the one which is present inside the room. ANSI/ASHRAE/ASHE Standard 170–2008 recommendations are followed for hospital applications, to facilitate effective ventilation. * e-mail: caused by severe acute respiratory syndrome (SARS) has accounted for huge collateral damage and as the virus is spreading faster and faster this study deals with isolation rooms or negative pressure rooms with 12 or more air changes per hour and maintaining a pressure difference of 2.5 pa which can help in reducing the transmission of the virus from affected to not affected persons. School of Mechanical Engineering, Vellore Institute of Technology, Chennai, Tamil Nadu 600127, India ![]() Chakka Anuraghava, Koppaka Abhiram, Vengalathur Naveen Sai Reddy and Harish Rajan * ![]()
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