Article
Thermodynamics
Ali Nosrati, Mohammadali Akhavan-Behabadi, Behrang Sajadi, Pooyan Razi, Rasool Mohammadi
Summary: The study on heat transfer coefficient and pressure drop of refrigerant R134a flow boiling in metal-foam filled annular tubes shows a significant increase in both heat transfer coefficient and pressure drop when using metal foam. These two parameters increase with an increment in pore density, and vary proportionally with mass flux.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Mechanics
Mehran Soleimani, Ali Ahmadpour, Ehsan Amani
Summary: In this study, three-dimensional numerical simulations were conducted to investigate the impact of direct current electric fields on subcooled flow boiling heat transfer in a vertical minichannel. The volume of fluid model was used to represent the liquid-vapor interfaces, and the conservation laws and electrohydrodynamic equations were solved using the finite volume method. Two mass transfer models were evaluated, and a new seeding algorithm was developed based on the physics of bubble formation and departure on heated walls, integrated with the Fourier model. The numerical results showed an early transition from slug to churn/annular flow regimes due to EHD forces, in agreement with experimental observations.
Article
Thermodynamics
Tianjiao Zhang, Liangdong Ma, Jili Zhang
Summary: This study experimentally investigated falling liquid film, pool boiling, and hybrid heat transfer with refrigerant R-134a outside a vertical tube. The results showed that the heat transfer ratio of falling film to pool boiling decreased as the heat flux increased. In the hybrid heat transfer mode analysis, it was found that at low heat flux, the heat transfer coefficients of a complete falling film were higher than those of other heat transfer modes. However, at high heat flux, a moderate increase in the submerged height of the tubes in the refrigerant improved the performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Biswajit Majumder, Ajay D. Pingale, Anil S. Katarkar, Sachin U. Belgamwar, Swapan Bhaumik
Summary: In this study, graphene nanoplatelets reinforced Al matrix composite coatings were fabricated and applied to investigate the pool boiling heat transfer performance. The results showed that the heat transfer coefficient of the Al@GNPs composite coated heating surface was 143% higher than that of the plain Al heating surface.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2022)
Article
Engineering, Chemical
Somayeh Davoodabadi Farahani, Mohammad Farahani, Davood Ghanbari
Summary: This study experimentally investigates the heat transfer of forced convection boiling of a R134a/nano oil mixture in a horizontally-aligned tube with an aluminum helical fin. The findings show that increasing mass flow enhances heat transfer coefficient, while adding nanoparticles can increase heat transfer, but a decreasing trend is observed at a certain vapor quality.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Thermodynamics
Mehrdad Mesgarpour, Rasool Alizadeh, Omid Mahian, Ahmet Selim Dalkilic, Ho Seon Ahn, Somchai Wongwises
Summary: This study focuses on numerical modelling of downward boiling of a refrigerant in a vertical corrugated tube with hot water flowing upward inside an outer tube. Optimization and vapor phase tracking methods are employed to improve heat transfer during the process. Structural optimization increases heat transfer rate by 11% and decreases friction factor by 9%. Varying corrugation depth results in slight increases followed by sudden decreases in average vapor quality.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Junlong Li, Chaozhu Zhang, Qi Zhang, Ping Yang, Fujun Gan, Shuo Chen, Zhenqin Xiong, Yao Xiao, Hanyang Gu
Summary: This article presents a flow boiling heat transfer experiment conducted in a vertical rod bundle and investigates the effects of parameters on wall superheating degree and heat transfer coefficient. New correlations are proposed to predict the experimental data.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Abhishek Kumar, Xiao-Zhe Wang, Boyapati Jaya Lakshmi, Jung-Tsung Hung, Yu-Kai Chen, Chi-Chuan Wang
Summary: The addition of polyolester lubricant oil significantly enhances the nucleate pool boiling performance for a horizontal smooth tube at different saturation temperatures. Specifically, POEA-68 lubricant shows a more pronounced effect on increasing HTC, while the variation of lubricant mass fraction leads to different impacts on HTC.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Ngoctan Tran, Ram Vineeth Kasireddy, Chi-Chuan Wang
Summary: The study found that the presence of lubricant and increase in oil concentration significantly affect the heat transfer coefficient, which increases with heat flux. Lubricant may lead to deterioration of HTC, especially at high vapor qualities.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Rishi L. Ramakrishnan, Prasanna Jayaramu, Sateesh Gedupudi, Sarit K. Das
Summary: This study experimentally investigated the effect of copper surface ageing on heat transfer and critical heat flux during flow boiling. The results showed that ageing significantly reduces the heat transfer coefficient on the copper surface, while having an insignificant impact on the critical heat flux. Surface morphology and wettability of copper were found to change after ageing.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jaco Dirker, Hannalie Scheepers, Josua P. Meyer
Summary: This article investigates the heat transfer characteristics of saturated flow boiling under non-uniform heat flux conditions. Experimental tests show that non-uniform heat flux conditions significantly reduce the average heat transfer coefficient, highlighting the need for further research on heat flux distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Nanoscience & Nanotechnology
Junsheng Hou, Junjie Wu, Hongqiang Chen, Lei Huang, Li Ma, Xiong Zhao, Zihan Ding, Yonghai Zhang, Jiabin Fang, Jinjia Wei, Satoshi Watanabe, Nanjing Hao
Summary: A facile microfluidic synthesis strategy is developed to prepare highly stable and size-controllable silica nanofluids, enhancing the heat transfer efficiency and providing new insights for the rational design of two-phase cooling nano-systems.
MATERIALS TODAY NANO
(2023)
Article
Thermodynamics
W. J. Van den Bergh, H. R. Moran, J. Dirker, C. N. Markides, J. P. Meyer
Summary: The study investigated flow boiling of R-245fa at low mass and heat fluxes. It was found that the heat transfer coefficient was influenced by both mass and heat fluxes, with an increase in mass flux leading to an increase in heat transfer coefficient. Higher vapor quality cases were more sensitive to mass flux, except at low heat flux conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jiaqi Tang, Yi Liu, Baoling Huang, Dongyan Xu
Summary: Enhancing flow boiling heat transfer in microchannels can effectively be achieved by adding expansion areas, leading to improved heat transfer coefficients and reduced temperature fluctuations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Yu Zhu, Xue Li, Yunjia Liu, Salisu Mubarak, Shixue Wang
Summary: The flow boiling characteristics in minigap channels were studied by analyzing the two-phase flow patterns, measuring pressure drops, and calculating heat transfer coefficients and critical heat fluxes. Results showed that different flow patterns occur with increasing heat fluxes. The gap height has an impact on the heat transfer coefficient. The critical heat flux is influenced by mass flux and gap height.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
V. Umesh, S. Bala Vignesh, B. Raja
EXPERIMENTAL HEAT TRANSFER
(2016)
Article
Thermodynamics
V. Umesh, B. Raja
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2015)
Article
Thermodynamics
V. Umesh, S. Balavignesh, B. Raja
JOURNAL OF ENGINEERING THERMOPHYSICS
(2018)
Article
Engineering, Civil
L. Godson, K. Deepak, C. Enoch, B. Jefferson, B. Raja
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2014)
Article
Thermodynamics
P. Balachander, B. Raja
HEAT AND MASS TRANSFER
(2015)
Article
Thermodynamics
R. Karthik, R. Harish Nagarajan, K. S. Praveen, B. Raja
JOURNAL OF ENGINEERING THERMOPHYSICS
(2014)
Article
Thermodynamics
G. Srinivasan, M. Muneeshwaran, B. Raja
HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
G. Srinivasan, B. Raja
HEAT AND MASS TRANSFER
(2019)
Article
Engineering, Chemical
Ganeshmurthy Srinivasan, Balakrishnan Raja
JOURNAL OF FOOD PROCESS ENGINEERING
(2020)
Article
Engineering, Multidisciplinary
G. Srinivasan, B. Raja
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2020)
Article
Thermodynamics
M. Muneeshwaran, G. Srinivasan, B. Raja, Chi-Chuan Wang
Summary: The study numerically investigated the effects of vial base curvature on product temperature, drying time, and mass transfer resistance, revealing that the vial base curvature can significantly impact the overall lyophilization process.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
K. Rajasekar, B. Raja
Summary: The electrochemical properties of Lithium Ferrous Phosphate (LFP) make it a promising cathode material for lithium-ion batteries in electric vehicles. Spray drying is commonly utilized for manufacturing LFP cathode powder, with the method producing particles of uniform size and structure. This paper presents a computational fluid dynamics study of the heat and mass transfer characteristics of the spray drying process, using a 2D axisymmetric model to simulate a drying chamber.
JOURNAL OF ENGINEERING THERMOPHYSICS
(2021)
Article
Engineering, Multidisciplinary
K. RAJASEKAR, B. RAJA
Summary: This paper presents the heat and mass transfer characteristics during spray drying of a saline solution using a full cone pressure-swirl nozzle of 0.2 mm diameter. The numerical model is experimentally validated and the particle heat and mass transfer characteristics are discussed.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2022)
Article
Thermodynamics
K. Rajasekar, B. Raja
Summary: The paper presents a detailed experimental investigation on heat and mass transfer characteristics during the synthesis of Na2Fe0.6Mn0.4PO4F/C using intermittent spray drying. The study explores the effect of intermittency on the spray drying process heat and mass transfer characteristics. It is found that increasing the nozzle orifice diameter and pumping pressure improves heat transfer, while increasing the spray time diminishes heat transfer. The volumetric heat transfer coefficient ranges between 1.5 and 3.5 kW/m3K, and the volumetric mass transfer coefficient ranges between 2.5 and 5.0 s-1 under the considered operating conditions. Correlations for heat and mass transfer coefficients are developed based on the study.
APPLIED THERMAL ENGINEERING
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
S. Balavignesh, V. Umesh, B. Raja
INTERNATIONAL CONFERENCE ON DESIGN AND MANUFACTURING (ICONDM2013)
(2013)
