Article
Thermodynamics
Fei Chen, Xin Jiang, Chenxi Lu, Yangwei Wang, Pin Wen, Qiang Shen
Summary: This paper investigates the heat efficiency of an adjustable heat exchanger with gradient thicknesses incorporating a TPMS structure. The results indicate that high heat transfer efficiency and low pressure drop can be achieved under certain conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Hyungseok Nam, Jung Hwan Kim, Hana Kim, Min Jae Kim, Sang-Goo Jeon, Gyoung-Tae Jin, Yooseob Won, Byung Wook Hwang, Seung-Yong Lee, Jeom-In Baek, Doyeon Lee, Myung Won Seo, Ho-Jung Ryu
Summary: In this study, CO2 methanation was conducted using a 0.2 kW CH4 bench-scale fluidized bed reactor with approximately 13 kg nickel-based catalyst to investigate the impact of temperature, gas velocity, and H-2/CO2 ratio on CO2 conversion, CH4 purity, and CH4 selectivity. Response surface methodology was employed to design experimental conditions to evaluate the effect of operating variables, and optimal conditions were determined for maximum CO2 conversion and CH4 purity.
Article
Thermodynamics
Mingze Su, Yuping Gao, Fufeng Zhao, Yingwen Liu, Rixin Li, Jinbo Li
Summary: In this article, 3D numerical simulations are conducted to investigate the heat transfer performances of different fin surfaces for a one-row fin-and-tube heat exchanger. Five fin surfaces are evaluated, including one plain fin surface for comparison and four slit fin surfaces. The results show that under the same pumping power, the heat transfer improvements of the slit fin surfaces range from 5.3% to 47.3% compared to the plain fin surface.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Xinren Xie, Xiang Zhang, Jingshuang Zhang, Qian Qiao, Zhicheng Jia, Yuanda Wu, Xiaohui Song, Huadong Zhao, Qian Li
Summary: A water-cooled thermoelectric component model for air cooling was established and validated through experiments. The effects of different air flow rates and water flow rates on the plate-fin heat sinks (PFHS) and thermoelectric cooling performance were studied. A Box-Behnken design model based on the response surface methodology was established for predicting and optimizing the heat transfer characteristics and coefficient-of-performance of the PFHS.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Review
Thermodynamics
Munonyedi Egbo, Mohammad Borumand, Yahya Nasersharifi, Gisuk Hwang
Summary: This paper reviews the effects of surface orientation on pool boiling, including experimental and theoretical approaches to understand the changes in heat transfer coefficient and critical heat flux. The results show that tailored two-phase flow can enhance the performance of pool boiling. This review also discusses future research directions for engineered surfaces under different surface orientations.
APPLIED THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Nadia Hamzawy, Tamer S. Mahmoud, Iman El-Mahallawi, Mahmoud Khedr, Tarek Khalifa
Summary: Thermal drilling is a chip-less hole-forming process affected by rotational speed, feed rate, and cone angle. This study investigates the effect of variations in friction drilling parameters on the surface roughness values and dimensions of a thermally induced bushing. Response surface methodology was used to optimize the drilling parameters, and the experimental results agree with the presented models. The optimal parameters for the lowest surface roughness value are a rotational speed of 1250 rpm, a feed rate of 200 mm/min, and a cone angle of 45 degrees.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Toygun Dagdevir
Summary: The research conducted numerical analysis on dimpled heat exchanger tube using Taguchi method and grey relation analysis, considering dimple diameter, pitch length, and height to achieve optimal heat transfer performance and minimal pressure drop. The study also identified the contribution levels of different parameters on convective heat transfer coefficient and pressure drop, and validated the optimization methodology through confirmation tests.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Mechanical
Ratnesh Kumar Gupta, Ramesh Chandra Singh
Summary: This study focuses on developing a squeeze film damper (SFD) to reduce vibration amplitudes of high-speed rotating shafts. The effects of SFD process parameters on vibration amplitudes are examined through experimental design and statistical analysis. Experimental validation confirms the effectiveness of the optimized parameters and provides valuable insights for improving vibration control and enhancing performance.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Review
Thermodynamics
Sudhir Kumar Singh, Deepak Sharma
Summary: This paper provides a comprehensive review of the importance of enhancing boiling heat transfer performance and the impact of various surface modification methods on heat transfer effects, proposing key technologies for reducing energy dissipation and improving heat transfer efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Materials Science, Ceramics
Mohammad Mohsin Khan, Abhijit Dey
Summary: The study focused on microstructural characterization and investigation on the optimum abrasive wear processing condition of newly developed in-situ TiC reinforced ZA37 alloys. Advanced vortex creating in-situ technique was used to process the MMCs. Non-linear characteristics of response variables were demonstrated by developing a quadratic regression model, and ANOVA was implemented to identify the contribution of process variables towards responses. Significant improvements were observed on wear rates, COF, and temperature when implementing optimal parametric combinations predicted by the GRA based hybrid approach.
CERAMICS INTERNATIONAL
(2021)
Article
Thermodynamics
Albin Joseph, Shijo Thomas
Summary: This paper presents an experimental analysis of the fouling factor and thermal performance of a carbon-dot nanofluid on a double-pipe heat exchanger. The study reveals that the flow rate of the fluid has a significant influence on the heat transfer coefficient, while the temperature has less significance on the performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Zhenwei Liu, Cameron Mcgregor, Songlin Ding, Xu Wang
Summary: This paper introduces a novel design of a speed amplified flux switching linear generator for the power take-off unit of an ocean wave energy converter. The design incorporates several innovative features, including semiclosed stator iron cores, four coil phases shifting, and a fixed pulley wheel mechanism. The proposed approach combines analytical techniques, hydrodynamic boundary element analysis, 3D electromagnetic finite element modeling, and machine learning methods, achieving an efficient and effective power take-off design. The experimental results confirm that the proposed flux switching linear generator outperforms conventional permanent magnet linear generators in terms of power output performance. Furthermore, the model is used to simulate and predict the generator's power output under various ocean environments, considering the hydrodynamics of the wave energy converter.
Article
Chemistry, Physical
Petr Kotrbacek, Martin Chabicovsky, Ondrej Resl, Jan Kominek, Tomas Luks
Summary: In order to achieve the required mechanical properties in steel heat treatment, it is important to have a sufficient cooling rate and reach the desired final temperature. Modern cooling systems utilize different types of nozzles to provide high variability. This paper proposes a design approach based on laboratory measurements, including finding or validating the required cooling regime and selecting appropriate nozzles.
Article
Automation & Control Systems
Afef Azzi, Lakhdar Boulanouar, Aissa Laouisi, Alima Mebrek, Mohamed Athmane Yallese
Summary: The objective of this study is to investigate the effect of machining parameters on the technological parameters, surface roughness, and material removal rate during the turning process of polytetrafluoroethylene (PTFE) polymer. The study found that the feed rate significantly influenced the surface roughness and material removal rate. Response surface methodology and artificial neural networks were used to model the output parameters and determine the optimal cutting parameters. The results showed that the optimal parameters for minimizing roughness and maximizing material removal rate were determined.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Matic Moze, Matevz Zupancic, Miha Steinbucher, Iztok Golobic, Henrik Gjerkes
Summary: This study presents the functionalization of copper surfaces to enhance pool boiling heat transfer. Different types of surface structures were developed using nanosecond laser texturing, and the boiling performance of each surface was evaluated. The functionalized surfaces exhibited enhanced heat transfer performance compared to the untreated reference. Surface microstructure was identified as the key factor for the improved heat transfer parameters.
Article
Thermodynamics
Rajeshwar Sripada, Siva Subrahmanyam Mendu, Divyasree Tentu, Shanmukh Simhadri Varanasi, Vasudeva Rao Veeredhi
Summary: CHF is a catastrophic failure mode encountered in various industries, with limited information available particularly in vertically downward two-phase flows. Accurate estimation of CHF is crucial for performance and safety, prompting the development of a new correlation for CHF in downward flow in vertical tubes with good agreement with experimental data.
EXPERIMENTAL HEAT TRANSFER
(2021)
Article
Thermodynamics
Sireesha Veeramachaneni, Srinivas Kishore Pisipaty, Dharma Rao Vedula, A. Brusly Solomon
Summary: Experiments were conducted to compare the thermal performance of water and methanol in a flat rectangular loop heat pipe, with water showing better performance in terms of thermal resistance, capillary limit, and effective thermal conductivity under different orientations and filling ratios.
EXPERIMENTAL HEAT TRANSFER
(2021)
Article
Thermodynamics
Siva Subrahmanyam Mendu, Prasanta Kumar Das
Summary: This paper numerically investigates steady-state natural convection in power-law fluids inside a square enclosure with discrete heaters using the lattice Boltzmann method. Results show that temperature and flow fields in the enclosure are symmetric about the vertical centerline, an increase in the power-law index leads to higher viscosity and reduced thermal energy transport, while circulation and heat transfer intensity increase with higher Rayleigh numbers and localized heater sizes.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Green & Sustainable Science & Technology
A. Padmaja, Allusivala Shanmukh, Siva Subrahmanyam Mendu, Ramesh Devarapalli, Javier Serrano Gonzalez, Fausto Pedro Garcia Marquez
Summary: This study explores the use of capacitive bridge fault current limiters (CBFCL) to limit short circuit currents and fulfill reactive power compensation for DFIG wind farms. The fuzzy-based CBFCL shows superior performance under fault conditions, effectively addressing the low voltage ride through (LVRT) issue.
Article
Environmental Sciences
S. S. Mendu, D. Nagaraju
Summary: Designing thermal systems with minimal entropy generation and improved thermal performance is crucial in engineering applications. This study investigates the impact of heater location, Rayleigh number, and constant temperature boundary conditions on the entropy generation in an air-filled square enclosure. By developing a numerical model and analyzing heat transfer and fluid friction-induced entropy generation, the researchers explore the sensitivity of entropy generation to the position of heaters and Rayleigh numbers. The study provides insights into optimizing the performance of thermal systems by determining the optimal location of heaters using Bejan numbers.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
N. S. Naveen, P. S. Kishore, Satish Pujari, M. Daniel Silas Kumar, Krishna Jogi
Summary: This paper investigates the effect of adding nano particles on the heat transfer parameters of a radiator and estimates them using optimization methods. The experimental results show that adding nano particles can enhance the performance of the radiator, and the estimation results through artificial neural networks are in good agreement with the experimental data.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2022)
Article
Thermodynamics
Sireesha Veeramachaneni, Srinivas K. Pisipaty, Arulanantham Brusly Solomon, Venkata C. Vadisa, Dharma R. Vedula, Devisetty Srinivasa Rao
Summary: The evaluation of compact loop heat pipe is done using a low thermal conductivity sintered chrysotile wick to avoid heat leaks. A wick with low thermal conductivity is fabricated through sintering at different temperatures. The properties of the wick are studied and it is found that the best wick has high porosity and permeability. This wick is used in a compact loop heat pipe and shows a decrease in thermal resistance compared to a copper mesh wick.
Article
Thermodynamics
Sireesha Veeramachaneni, Srinivas Kishore Pisipaty, Dharma Rao Vedula, A. Brusly Solomon, V. Sree Harsha
Summary: A novel hybrid nanofluid has been experimentally tested for its effects on the heat transfer performance of flat rectangular loop heat pipe, showing higher performance than water in terms of thermal resistance and effective thermal conductivity.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
A. Naresh Kumar, B. Ashok, K. Nanthagopal, H. C. Ong, M. J. Geca, John Victor, R. Vignesh, A. K. Jeevanantham, C. Kannan, P. S. Kishore
Summary: The present work focuses on enhancing the viability of palm biodiesel for CI engine applications by using the reformulation strategy of adding higher alcohols. The experimental results show that the addition of higher alcohols improves the engine's efficiency and reduces fuel consumption. It also has a positive impact on exhaust emissions, particularly in reducing NOx emissions.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Physical
N. S. Naveen, P. S. Kishore
Summary: This study compares the forced convective heat transfer of Water-EG coolant and Water-EG based nanocoolant in a radiator. The heat transfer parameters under different flow rates and temperature conditions are experimentally evaluated.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
P. V. S. Muralikrishna, P. S. Kishore, N. Ramanaiah, V. V. S. P. K. Pathanjali
Summary: Gas turbine engines designers aim to achieve high performance levels through means such as increasing turbine entry temperature. Advances in materials and thermal barrier coating technology have significantly contributed to achieving this functionality. This dissertation work presents a thin film sensor based approach for experimental evaluation of temperatures on hot section aero gas turbine engine components made of nickel chromium based alloy with coating.
MATERIALS TODAY-PROCEEDINGS
(2021)
Article
Multidisciplinary Sciences
Nagaraju Dora, Siva Subrahmanyam Mendu, B. H. Lakshmipati Raju
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2020)
Article
Energy & Fuels
Laura L. Trinkies, Marlene Crone, Michael Tuerk, Manfred Kraut, Roland Dittmeyer
Summary: In this study, mono- and bimetallic Pd and Pt catalysts were deposited via supercritical fluid reactive deposition (SFRD) on TiO2 coated additively manufactured substrates. The focus of this work was to evaluate the suitability of these catalysts for the direct synthesis of H2O2 in the liquid phase. The results showed that all catalysts exhibited high activity and productivity, with PdPt bimetallic catalysts showing the highest productivity and an increase in Pd loading leading to a decrease in productivity. Comparison with literature data demonstrated the high suitability of the SFRD method for the proposed application, with the added benefits of simplicity and environmental friendliness in catalyst production.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
Article
Energy & Fuels
Xiongbao Hu, Zuguo Shen, Yu Wang
Summary: It is impossible to control the outer wall temperature of the micro-combustor below the maximum allowable temperature of commercial thermoelectric generators simply through increasing the equivalent heat transfer coefficient. Three simple strategies were developed to improve temperature uniformity, yet none of them could ensure full temperature control.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2024)
