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Research Interest

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• Computational Fluid Dynamics (CFD)
• Thermal Comfort
• Building Energy Efficiency
• Thermal Energy Storage and Management
• Personal Cooling/Heating Systems
• Thermal Protection and Protective Clothing
• Bio-heat Transfer and Skin Burn Injuries
• Heat Stress Mitigation
• Inverse Heat Transfer
• Continuous Casting
• Heat Transfer through Fabrics and Clothing-Environment Interaction
• Nature-inspired Optimization Algorithms
• Convection/Radiation Heat Transfer in Porous Mediums

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Education

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• Ph.D., 2017, Indian Institute of Technology Delhi, New Delhi, India
• M.Tech., 2012, National Institute of Technology Calicut, Kerala, India
• B.Tech., 2010, G B Pant Engineering College, Pauri-Garhwal, Uttarakhand, India

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Professional Experience

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• November 2024 - till date: Associate Professor, Indian Institute of Technology Bhilai, CG, India
• June 2018 - November 2024: Assistant Professor, Indian Institute of Technology Bhilai, CG, India
• May 2021 - July 2021: Visiting Professor, School of Design, Jiangnan University, China
• June 2017 - June 2018: Post doctoral Research Associate at The Hong Kong Polytechnic University, Hong Kong

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Courses Taught

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• ME 212: Fluid Mechanics
• ME 213: Heat and Mass Transfer
• ME 230: Fluid Mechanics-II
• ME 413: Refrigeration & Air Conditioning
• ME 512: Advanced Fluid Mechanics
• ME 513: Convective Heat Transfer
• ME 624/MEL 624: Energy Conservation and Management
• ME 673: Computational Fluid Dynamics Laboratory
• ME 372: Mechanical Engineering Laboratory (Fluid Mechanics & Heat Transfer)
• ME 798: Computational Fluid Dynamics (Independent Study)
• ME 798: Building Environment and Energy Conservation (Independent Study)
• ME 798: Human Body Thermoregulation & Bio-heat Transfer (Independent Study)

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Sponsered/Consultancy Projects

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• 1. Funding Agency: IIT Bhilai, Research Initiation Grant; Duration: October 2019 - October 2022; Area: Personal Cooling Clothing (Principal Investigator)
• 2. Funding Agency: Indo-Swiss Building Energy Efficiency Project (BEEP); Duration: February 2020 - December 2021; Area: Building Energy Efficiency (Principal Investigator)
• 3. Funding Agency: Science and Engineering Research Board (SERB), Startup Research Grant; Duration: December 2020 - December 2022; Area: Heat Stress Mitigation & Thermal Comfort (Principal Investigator)
• 4. Funding Agency: Department of Science and Technology (DST), Technology Development & Transfer; Duration: March 2021 - March 2024; Area: Thermal Protective Clothing (Co-Investigator; PI: Prof. Apurba Das, IIT Delhi)
• 5. Funding Agency: IBITF; Duration: January 2024 - January 2026; Area: Wearable Solutions for Heat Stress (Principal Investigator; Co-PI: Dr. Shailendra Kumar, IIT Bhilai; Prof. Ravi Saxena, IGAU; Mr. Abhijeet Kaushik, NIC)

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Publications

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Patent

• Apparatus for measurement of heat transfer through thermal protective clothing. Indian Patent, Patent No: 488431, Date of Grant: 24 December 2023.

White Paper

• J Mathur, M Maija, N Gupta, P Tiwari, S Kachhawa, S Dhaka, Udayraj, V R Khare. ISHRAE White paper on Thermal Comfort. The Indian Society of Heating, Refrigerating and Air Conditioning Engineers (ISHRAE), 2021.

Book

• Udayraj. Building Heat Transfer: Understanding through numerical examples. Bureau of Energy Efficiency, 2021.

Book Chapters

• K U Mekrisuh, Udayraj, D Singh. Design Improvement of a Vertically Oriented Thermal Energy Storage System Considering Melting Front Propagation. Recent Advances in Mechanical Infrastructure. Lecture Notes in Intelligent Transportation and Infrastructure. Editors: A K Parwani, P Ramkumar, K Abhishek, S K Yadav. Lecture Notes in Intelligent Transportation and Infrastructure (Springer), 2021 (ISBN: 978-981-33-4175-3).
• Y Ke, Udayraj, Z Li, F Wang. Hot plates and thermal manikins for evaluating clothing thermal comfort. Protective Clothing and Equipment used for firefighter: Performance, Protection and Comfort. Editors: G Song and F Wang. Taylor & Francis (CRC Press), 2018 (ISBN: 978-1-49-874273-3).
• F Wang, Udayraj. Human wear trials for assessing comfort performance of firefighter protective clothing. Protective Clothing and Equipment used for firefighter: Performance, Protection and Comfort. Editors: G Song and F Wang. Taylor & Francis (CRC Press), 2018 (ISBN: 978-1-49-874273-3).

International Journals

• K U Mekrisuh, D Singh, Udayraj. Development and experimental validation of a 3D numerical model to investigate performance of phase change based cooling vest in hot environments. International Journal of Thermal Sciences, 208, 109487, 1-18, 2025.
• B Choudhary, Udayraj. A modified multi-node human thermoregulation model with improved sweating response to simulate human physiological behaviours in warm and hot environments. Building and Environment, 267, 112164, 1-17, 2025.
• H Maurya, R Rathour, Udayraj, A Das, R Alagirusamy. Mathematical modelling and experimental validation of thermal conductivity of outer layer of fire protective clothing. The Journal of The Textile Institute, --, 1-12, 2024.(Accepted).
• V Kapsalis, C Maduta, N Skandalos, M Wang, S S Bhuvad, D D’Agostino, T Ma, Udayraj, D Parker, J Peng, D Karamanis. Critical assessment of large-scale rooftop photovoltaics deployment in the global urban environment. Renewable & Sustainable Energy Reviews, 189, 114005, 1-27, 2024.
• V Kapsalis, C Maduta, N Skandalos, S S Bhuvad, D D’Agostino, R J Yang, Udayraj, D Parker, D Karamanis. Bottom-up energy transition through rooftop PV upscaling: remaining issues and emerging upgrades towards NZEBs at different climatic conditions. Renewable and Sustainable Energy Transition, 5, 100083, 1-19, 2024.
• K U Mekrisuh, Udayraj, D Singh. Thermal performance analysis of concentric-tube latent heat storage systems integrated with varying energy source under various charging strategies. Journal of Energy Storage, 72(B), 108378, 1-17, 2023.
• B Choudhary, Udayraj. Effectiveness of air ventilation clothing in hot and humid environment for decreasing and intermittent activity scenarios. Building and Environment, 239, 110436, 1-16, 2023.
• B Choudhary, Udayraj. Local and overall convective heat transfer coefficients for human body with air ventilation clothing: Parametric study and correlations. Building and Environment, 229, 109953, 1-19, 2023.
• B Choudhary, Udayraj. Validity of the JOS-3 model for male tropical population and analysis of their thermal comfort. Sādhanā, 48, 208, 1-19, 2023.
• N Skandalos, M Wang, V Kapsalis, D D’Agostinod, D Parkere, S S Bhuvad, Udayraj, J Peng, D Karamanis. Building PV integration according to regional climate conditions: BIPV regional adaptability extending Köppen-Geiger climate classification against urban and climate-related temperature increases. Renewable & Sustainable Energy Reviews, 109, 103307, 1-12, 2022.
• I H Rizvi, Udayraj. A modified Kalman filter-based model for core temperature estimation during exercise and recovery with/without personal cooling interventions. Journal of Thermal Biology, 109, 103307, 1-12, 2022.
• B Choudhary, Udayraj. A coupled CFD-thermoregulation model for air ventilation clothing. Energy and Buildings, 268, 112206, 1-18, 2022.
• S S Bhuvad, Udayraj. Investigation of annual performance of a building shaded by rooftop PV panels in different climate zones of India. Renewable Energy, 189, 1337-1357, 2022.
• K Singh, Udayraj. Combined film and impingement cooling of flat plate with reverse cooling hole. Applied Thermal Engineering, 208, 118224, 1-16, 2022.
• D Singh, Udayraj, A N Singh, J Handique. Experimental and LES study of unconfined jet impingement on a smooth flat heated plate with slots of different widths. Experimental Heat Transfer, , 1-41, 2022 (Accepted).
• D Singh, A K Rao, Udayraj. Effect of taper and perforation on heat transfer coefficient of a passive horizontal heat sink. Heat Transfer Engineering, , 1-16, 2022 (Accepted).
• M Zhao, J Yang, F Wang, Udayraj, W C Chan. The cooling performance of forced air ventilation garments in a warm environment: the effect of clothing eyelet designs. The Journal of The Textile Institute, , 1-16, 2022 (Accepted).
• A K Ray, S Singh, D Rakshit, Udayraj. Comparative study of cooling performance for portable cold storage box using phase change medium. Thermal Science and Engineering Progress, 27, 101146, 1-11, 2022.
• P Saikia, D Rakshit, R Narayanaswamy, F Wang, Udayraj. Energy performance and indoor airflow analysis of a healthcare ward designed with resource conservation objectives. Journal of Building Engineering, 44, 103296, 1-20, 2021.
• K U Mekrisuh, S Giri, Udayraj, D Singh, D Rakshit. Optimal design of the phase change material based thermal energy storage systems: Efficacy of fins and/or nanoparticles for performance enhancement. Journal of Energy Storage, 33, 102126, 1-14, 2021.
• P Xu, Z Kang, F Wang, Udayraj. A numerical analysis of the cooling performance of a hybrid personal cooling system (HPCS): Effects of ambient temperature and relative humidity. International Journal of Environmental Research and Public Health, 17, 4995, 2020.
• F Wang, Y Ke, Udayraj, B Yang, P Xu, N Noor. Effect of cooling strategies on overall performance of a hybrid personal cooling system incorporated with phase change materials (PCMs) and electric fans. Journal of Thermal Biology, 92, 102655, 2020.
• J Yang, F Wang, G Song, R Li, Udayraj. Effects of clothing size and air ventilation rate on cooling performance of air ventilation clothing in a warm condition. International Journal of Occupational Safety and Ergonomics, 28 (1), 354-363, 2020.
• B Choudhary, Udayraj, F Wang, Y Ke, J Yang. Development and experimental validation of a 3D numerical model based on CFD of the human torso wearing air ventilation clothing. International Journal of Heat and Mass Transfer, 147, 2020.
• K U Mekrisuh, D Singh, Udayraj. Performance analysis of a vertically oriented concentric-tube PCM based thermal energy storage system: Parametric study and correlation development. Renewable Energy, 149, 902-916, 2020.
• Z Kang, F Wang, Udayraj. An advanced three-dimensional thermoregulation model of the human body: Development and validation. International Communications in Heat and Mass Transfer, 107, 34-43, 2019.
• Udayraj, F Wang, W Song, Y Ke, P Xu, C S W Chow, N Noor. Performance enhancement of hybrid personal cooling clothing in a hot environment: PCM cooling energy management with additional insulation. Ergonomics, 62 (7), 928-939, 2019.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Design and development of a test method for analyzing protective performance of gloves exposed to radiant heat based on CFD analysis. Heat Transfer Engineering 40 (1-2), 95-108, 2019.
• Z Kang*, Udayraj*, X Wan*, F Wang. A new hybrid personal cooling system (HPCS) incorporating insulation pads for thermal comfort management: Experimental validation and parametric study. Building and Environment, 145, 276-289, 2018.
* These authors contributed equally to this work.
• Udayraj, Z Li, Y Ke, F Wang, B Yang. Personal cooling strategies to improve thermal comfort in warm indoor environments: comparison of a conventional desk fan and air ventilation clothing. Energy and Buildings, 174, 439-451, 2018.
• Udayraj, Z Li, Y Ke, F Wang, B Yang. A study of thermal comfort enhancement using three energy-efficient personalized heating strategies at two low indoor temperatures. Building and Environment, 143, 1-14, 2018.
• X Wan, F Wang, Udayraj. Numerical analysis of cooling effect of hybrid cooling clothing incorporated with phase change material (PCM) packs and air ventilation fans. International Journal of Heat and Mass Transfer, 126, 636-648, 2018.
• Udayraj, F Wang. A three-dimensional conjugate heat transfer model for thermal protective clothing. International Journal of Thermal Sciences, 130, 28–46, 2018.
• Udayraj, P Talukdar, A Das, R Alagirusamy, Numerical investigation of the effect of air gap orientations and heterogeneous air gap in thermal protective clothing on skin burn. International Journal of Thermal Sciences, 121, 313-321, 2017.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Numerical modeling of heat transfer and fluid motion in air gap between clothing and human body: Effect of air gap orientation and body movement. International Journal of Heat and Mass transfer, 108, 271-291, 2017.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Effect of structural parameters on thermal protective performance and comfort characteristic of fabrics. The Journal of The Textile Institute, 108 (8), 1430-1441, 2017.
• Udayraj, S Chakraborty, S Ganguly, E Z Chacko, S K Ajmani, P Talukdar. Estimation of surface heat flux in continuous casting mould with limited measurement of temperature. International Journal of Thermal Sciences, 118, 435-447, 2017.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Development of correlations and artificial neural network models to predict second-degree burn time for thermal-protective fabrics. The Journal of The Textile Institute, 108, 260-270, 2017.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Heat and mass transfer through thermal protective clothing: A review. International Journal of Thermal Sciences, 106, 32-56, 2016.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Simultaneous estimation of thermal conductivity and specific heat of thermal protective fabrics using experimental data of high heat flux exposure. Applied Thermal Engineering, 107, 785–796, 2016.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Estimation of radiative properties of thermal protective clothing. Applied Thermal Engineering, 100, 788–797, 2016.
• Udayraj, K Mulani, P Talukdar, A Das, R Alagirusamy. Performance analysis and feasibility study of Ant Colony Optimization, Particle Swarm Optimization and Cuckoo Search algorithms for inverse heat transfer problems. International Journal of Heat and Mass Transfer, 89, 359-378, 2015.
• Udayraj, P Talukdar, R Alagirusamy, A Das. Heat transfer analysis and second degree burn prediction in human skin exposed to flame and radiant heat using dual phase lag phenomenon. International Journal of Heat and Mass Transfer, 78, 1068-1079, 2014.
• Md. Ateeque, Udayraj, R K Mishra, V P Chandramohan, P Talukdar. Numerical modeling of convective drying of food with spatially dependent transfer coefficient in a turbulent flow field. International Journal of Thermal Sciences, 78, 145-157, 2014.

International Conferences

• K U Mekrisuh, Udayraj, Dushyant Singh, Rajnish Azad. Development of a torso thermal manikin to analyze performance of PCM vest. Proceedings of the International Conference on Functional Textile and Clothing, IIT Delhi, Delhi, India, 2023.
• D Nagaraju, Udayraj. Analysis of thermal response of commonly used envelope designs for energy efficient buildings in composite climate of India. Proceedings of the 26th National and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2021), IIT Madras, Chennai, India, 2021.
• I H Rizvi, Udayraj. Estimation of human body core temperature from measured heart rate using Kalman filter models. Proceedings of the 26th National and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2021), IIT Madras, Chennai, India, 2021.
• K U Mekrisuh, Udayraj, Dushyant Singh. Design improvement of a vertically oriented thermal energy storage system considering melting front propagation. Proceedings of the 2nd International Conference on Recent Advances in Mechanical Infrastructure (ICRAM 2020), IITRAM, Gujarat, India, 2020.
• B Choudhary, Udayraj, F Wang. Numerical analysis of cooling performance of air ventilation clothing. Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019), IIT Roorkee, Roorkee, India, 2019.
• Udayraj. Effect of UHI and building geometry on pollution dispersion in an urban street canyon. Proceedings of the 5th International Conference on Countermeasures to Urban Heat Islands (IC2UHI 2019), IIIT Hyderabad, Hyderabad, India, 2019 [Best Paper Award].
• K Siwach, G Bhamania, Udayraj. Assessment of fluid flow and pollutant dispersion in urban street canyon using computational fluid dynamic (CFD). Poster presented in International Seminar on Sustainable Environment and Agriculture under Global Climate Change, 2019, Rohtak, Haryana, India, 2019.
• K U Mekrisuh, D Singh, Udayraj. Numerical analysis of effect of aspect ratio and flow rate on the performance of PCM based thermal energy storage system. Proceedings of The Third International Conference on Sustainable Energy and Environmental Challenges, 3rd SEEC, Roorkee, India, 2018.
• Udayraj. Numerical study to analyze effect of fabric radiative properties on heat transfer and protective performance. Proceedings of the 6th International Conference on Technical Textiles and Nonwovens, ICTN 2018, IIT Delhi, India, 2018.
• Udayraj, F Wang, P Talukdar, A Das, R Alagirusamy. A numerical study to analyze the effect of dynamic and heterogeneous microclimates in protective clothing on skin burn injuries. Proceedings of the 17th International Conference on Environmental Ergonomics, ICEE 2017, Kobe, Japan, 2017.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Determination of extinction coefficient and scattering albedo of woven fabrics. Proceedings of the 8th International Symposium on Radiative Transfer, RAD-16, Cappadocia, Turkey, 2016.
• Udayraj, P Talukdar, A Das, R Alagirusamy. Heat transfer analysis in human skin subjected to flash fire: Investigation of dual phase lag phenomenon. Proceedings of the 15th International Heat Transfer Conference, Kyoto, Japan, 2014.
• Udayraj, A Das, R Alagirusamy, M S Parmar, P Talukdar. Effect of process parameters on thermal protective performance and comfort characteristics of flame retardant treated fabrics. Proceedings of the International Conference on Technical Textiles and Nonwovens 2014, Delhi, India, 2014.

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Profiles

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