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440 results on '"Kumar, Raushan"'

18. Out-of-Plane Biphilic Surface Structuring for Enhanced Capillary-Driven Dropwise Condensation

Author

Stendardo, Luca, Milionis, Athanasios, Kokkoris, George, Stamatopoulos, Christos, Sharma, Chander Shekhar, Kumar, Raushan, Donati, Matteo, and Poulikakos, Dimos

Subjects
Physics - Fluid Dynamics, Physics - Computational Physics
Abstract

Rapid and sustained condensate droplet departure from a surface is key towards achieving high heat transfer rates in condensation, a physical process critical to a broad range of industrial and societal applications. Despite progress in enhancing condensation heat transfer through inducing its dropwise mode with hydrophobic materials, sophisticated surface engineering methods that can lead to further enhancement of heat transfer are still highly desirable. Here, by employing a three-dimensional, multiphase computational approach, we present an effective out-of-plane biphilic surface topography, that reveals an unexplored capillarity-driven departure mechanism of condensate droplets. This texture consists of biphilic diverging micro-cavities wherein a matrix of small hydrophilic spots is placed at their bottom, that is, amongst the pyramid-shaped, superhydrophobic micro-textures forming the cavities. We show that an optimal combination of the hydrophilic spots and the angles of the pyramidal structures can achieve high deformational stretching of the droplets, eventually realizing an impressive slingshot-like droplet ejection process from the texture. Such a droplet departure mechanism has the potential to reduce the droplet ejection volume and thus enhance the overall condensation efficiency, compared to coalescence-initiated droplet jumping from other state-of-the-art surfaces. Simulations have shown that optimal pyramid-shaped biphilic micro-structures can provoke droplet self-ejection at low volumes, up to 56% lower compared to superhydrophobic straight pillars, revealing a promising new surface micro-texture design strategy towards enhancing condensation heat transfer efficiency and water harvesting capabilities.

Published
2022

21. Assessing the Environmental Impacts of Agriculture, Industrial Operations, and Mining on Agro-Ecosystems

Author

Padhiary, Mrutyunjay, Kumar, Raushan, Kacprzyk, Janusz, Series Editor, Dorigo, Marco, Editorial Board Member, Engelbrecht, Andries, Editorial Board Member, Kreinovich, Vladik, Editorial Board Member, Morabito, Francesco Carlo, Editorial Board Member, Slowinski, Roman, Editorial Board Member, Wang, Yingxu, Editorial Board Member, Jin, Yaochu, Editorial Board Member, Azrour, Mourade, editor, Mabrouki, Jamal, editor, Alabdulatif, Abdulatif, editor, Guezzaz, Azidine, editor, and Amounas, Fatima, editor

Published
2024
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22. Prediction of Slope Failure Susceptibility of an Iron Ore Mine Using PCA and K-Means Clustering

Author

Nanda, Suryajyoti, Kumar, Raushan, Patel, Shantanu, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Gawad, Iman O., Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, Çiner, Attila, editor, Ergüler, Zeynal Abiddin, editor, Bezzeghoud, Mourad, editor, Ustuner, Mustafa, editor, Eshagh, Mehdi, editor, El-Askary, Hesham, editor, Biswas, Arkoprovo, editor, Gasperini, Luca, editor, Hinzen, Klaus-Günter, editor, Karakus, Murat, editor, Comina, Cesare, editor, Karrech, Ali, editor, Polonia, Alina, editor, and Chaminé, Helder I., editor

Published
2024
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31. Subcutaneous pseudomycetoma of the knee caused by Acremonium species in a diabetic male: A case report

Author

Viplov V. Vaidya, Sagar Chandrakar, Nitin S. Kumbhar, Kailash M. Jorule, Kumar Raushan, Nikhil S. Sane, and Sohini Arora

Subjects
acremonium, mycetoma, pseudomycetoma, Medicine
Abstract

A subcutaneous infection in the form of pseudomycetoma is rare. Acremonium species are rarely considered to be pathogenic in subcutaneous infections due to their ubiquitous nature. We report a case of subcutaneous pseudomycetoma over the dorsolateral aspect of the left knee caused by Acremonium species in a 55-year-old diabetic male who was treated successfully with oral itraconazole.

Published
2023
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38. A New High-Resolution Flux-Corrected Algorithm for the 1-D Euler Equations of Gas Dynamics

Author

Hemanth Kumar, R. M., Arun, M., Suryanarayanan, V., Nirmal Naathan, K. V., Kumar, Raushan, Cavas-Martínez, Francisco, Editorial Board Member, Chaari, Fakher, Series Editor, di Mare, Francesca, Editorial Board Member, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Editorial Board Member, Ivanov, Vitalii, Series Editor, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Banerjee, Jyotirmay, editor, Shah, Rupesh D., editor, Agarwal, Ramesh K., editor, and Mitra, Sushanta, editor

Published
2023
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