Article
Thermodynamics
Carlos A. Dorao, Maria Fernandino
Summary: The heat transfer mechanisms during flow condensation of binary mixtures inside pipes have been extensively studied, and it has been found that the heat transfer coefficient follows a similar scaling law for single and binary component fluids. This discovery reduces the complexity of the model and suggests that the dominant heat transfer resistance is located in the conductive sublayer, unaffected by the flow pattern, liquid film thickness, or mass transfer resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Multidisciplinary
Farhan Ahmed
Summary: The present study investigates the influence of constant pressure gradient on flow and heat transfer rate of Jeffrey fluid through concentric pipes annular sector duct. Simulation results show that increasing the ratio of relaxation to retardation times, lambda, can improve the friction factor under certain conditions, while the forced convective heat transfer rate remains almost constant in the absence of viscous dissipation. Additionally, the effect of viscous dissipation becomes favorable with the increase in Brinkman number, Br, on heat transfer rate for higher value of lambda at specific radius ratio and apex angle of the concentric pipes annular sector duct.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Thermodynamics
H. R. Moran, D. Zogg, V. Voulgaropoulos, W. J. Van den Bergh, J. Dirker, J. P. Meyer, O. K. Matar, C. N. Markides
Summary: Experimental data on flow boiling in a horizontal pipe was analyzed, including flow patterns, pressure drops, and heat transfer coefficients, with comparisons made to existing literature. The study also verified the predictive methods for pressure drop and heat transfer coefficient using common correlations in this macroscopic boiling flow investigation.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Aerospace
David Leiser, Fabian Hufgard, Christian Duernhofer, Stefan Loehle, Stefanos Fasoulas
Summary: This paper proposes a methodology to scale the stagnation point plasma conditions of an axially symmetric body to a two-dimensional planar body, providing a theoretical basis for the testing of material samples under thermochemical loads combined with aeromechanical loads, and the experimental verification has been conducted.
Article
Chemistry, Physical
Alireza Banisharif, Patrice Estelle, Alimorad Rashidi, Stephan Van Vaerenbergh, Masoud Aghajani
Summary: This study experimentally confirmed the significant enhancement of convective heat transfer by nanofluids in pipe heat exchangers for ethanol condensation. Different types of nanoparticles have varying effects on enhancing heat transfer performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Yanan Camaraza-Medina, Abel Hernandez-Guerrero, J. Luis Luviano-Ortiz
Summary: An improved method for heat transfer calculations inside rough tubes has been proposed and verified with a wide range of experimental data. The model shows good correlation within specified ranges of parameters, making it accurate and reliable for practical applications. No similar method with comparable characteristics is currently available in technical literature.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Thermodynamics
Chuanshuai Dong, Takashi Hibiki
Summary: The aim of this study is to develop a robust and theoretically supported heat transfer coefficient correlation for downward two-component two-phase flow in inclined pipes. A new correlation was proposed based on an extensive literature review and analysis of experimental data. This new correlation is of practical importance in understanding the two-component two-phase heat transfer characteristics.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Siqin Hou, Jiao Li, Guoqing Shen, Mingyang Sun, Shiping Zhang
Summary: This study investigates the optimal experimental conditions of acoustic field-enhanced heat transfer using an experimental platform for convective heat transfer in a double-pipe exchanger. The experiment compares laminar flow and turbulent flow states, as well as the arrangement of horizontal and vertical pipes, to explore the enhancement effect of the acoustic field on heat transfer. The results show that the vertical pipe in laminar flow condition and the horizontal pipe in turbulent flow condition have the highest heat transfer capacities with maximum reinforcement efficiencies of 43.6% and 24.5% respectively.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Chuanshuai Dong, Ronghui Qi, Lizhi Zhang
Summary: This paper develops a novel mechanistic model for flow and heat transfer in two-phase slug flow in horizontal pipes. The model is validated by experimental results and comprehensively investigates the dependence of heat transfer performance on overall and local flow parameters.
Article
Chemistry, Physical
Saeid Vafaei, Jonathan A. Yeager, Peter Daluga, Branden Scherer
Summary: It was found that the characteristics of nanoparticles, base liquid, thermal conductivity and viscosity of nanofluid can significantly affect the heat transfer coefficient. Man-made anatase TiO2 nanoparticles were found to be more effective in enhancing the heat transfer coefficient.
Article
Energy & Fuels
Mohammad Rezaei, Hossein Ali Pakravan
Summary: Ice slurries can effectively store thermal energy and improve the efficiency of refrigeration systems. This study investigated the thermo-hydraulic behavior of ice slurry in U-Bend pipes using numerical simulations and experimental validation. The results showed that the heat transfer coefficient and pressure drop increased with the ice particle diameter, Reynolds number, and ice volume fraction.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Mohammad Outokesh, Amirreza Mottafegh, Ali Nouri-Borujerdi, Saeed Dolati
Summary: Recent advances in CO2-based refrigeration systems have necessitated the derivation of heat transfer correlations for designing the corresponding industrial equipment. This study focuses on deriving such correlations for indirect sublimation, through conduction mechanism, where a material is sublimated on a hot surface by transferring energy. An experimental-theoretical approach was taken to investigate this subject under constant wall temperature conditions. A real-time temperature and weight display apparatus was constructed to sublimate dry ice blocks of different sizes, with circular and rectangular geometries. The heat transfer coefficient, hsub, decreased from 126 to 70 W/m2K as the temperature of the hotplate changed from -30 to 200 degrees C. These coefficients are approximately one-fourth of those in flow (direct) sublimation. The weight and area of the block had positive and negative effects on heat transfer, respectively. In the theoretical part, two models, linear-gradient and semi-analytical, were developed. The more accurate semi-analytical model estimated hsub with average errors of 6.4% and 21.3% in circular and rectangular geometries, while the linear-gradient model had respective errors of 17.3% and 25.9%.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Review
Chemistry, Multidisciplinary
Fernando Rivas-Cruz, Eduardo Gamaliel Hernandez-Martinez, Rogelio de Jesus Portillo-Velez, Leonardo Rejon-Garcia
Summary: The use of Ground Source Heat Pumps (GSHPs) has experienced rapid growth worldwide due to its advantages of low energy consumption and reduced emissions. However, the high cost of Ground Heat Exchanger (GHE) installation is a major obstacle to its widespread adoption. Previous studies have focused on improving heat transfer in GHEs using nanotechnology, including the development of nanofluids and new materials, as well as the design of new heat exchanger configurations.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Matthew T. Hughes, Srinivas Garimella
Summary: Enhanced condensation is crucial for improving and miniaturizing power generation and refrigeration systems. This study focuses on developing local design guidelines for condensing flows, comparing the benefits of enhancing low, medium, and high-quality condensation, and analyzing three enhancement techniques. Results show that heat transfer enhancement is achieved when the increase in heat exchanger conductance exceeds the reduction in temperature difference induced by condensation pressure drop.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Bertrand Jozwiak, Grzegorz Dzido, Anna Kolanowska, Rafal G. Jedrysiak, Edward Zorebski, Heather F. Greer, Marzena Dzida, Slawomir Boncel
Summary: This study investigated the heat transfer performance of ionanofluids composed of long multi-walled carbon nanotubes and an ionic liquid, showing that heat transfer is dominated by convection mechanisms. The amalgamation of these components was justified by a new thermo-economic efficiency-price index, demonstrating advantages in both thermophysical and economic aspects.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Srbislav B. Genic, Branislav M. Jacimovic, Uros M. Milovancevic, Milos M. Ivosevic, Milena M. Otovic, Milan I. Antic
HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Adrian Eugen Cioabla, Francisc Popescu, Gavrila Trif-Tordai, Alina-Gabriela Dumitrel, Paul-Dan Oprisa-Stanescu, Dorin Lelea
Article
Thermodynamics
Uros M. Milovancevic, Branislav M. Jacimovic, Srbislav B. Genic, Faraj El-Sagier, Milena M. Otovic, Snezana M. Stevanovic
Article
Thermodynamics
Milos Ivosevic, Andrija Petrovic, Branislav Jacimovic, Srbislav Genic
HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Sasa Markovic, Branislav Jacimovic, Srbislav Genic, Milos Mihailovic, Uros Milovancevic, Milena Otovic
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
(2019)
Article
Engineering, Chemical
Nikola Jacimovic, Srbislav Genic, Branislav Jacimovic
CHEMICAL ENGINEERING & TECHNOLOGY
(2019)
Article
Thermodynamics
Milos Mihailovic, Uros Milovancevic, Srbislav Genic, Branislav Jacimovic, Milena Otovic, Petar Kolendic
EXPERIMENTAL HEAT TRANSFER
(2020)
Article
Energy & Fuels
Branislav Jacimovic, Srbislav Genic, Nikola Jacimovic
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Engineering, Mechanical
Dorin Lelea, Adrian Eugen Cioabla
INGINERIA AUTOMOBILULUI
(2019)
Proceedings Paper
Multidisciplinary Sciences
V Stoica, M. Ilie, A. Borborean, A. Cioabla, D. Lelea
INTERNATIONAL CONFERENCE ON APPLIED SCIENCES
(2019)
Proceedings Paper
Multidisciplinary Sciences
M. E. Filip, G. Csaba, D. Lelea
INTERNATIONAL CONFERENCE ON APPLIED SCIENCES
(2019)
Proceedings Paper
Multidisciplinary Sciences
A. T. Borborean, V Stoica, D. Lelea
INTERNATIONAL CONFERENCE ON APPLIED SCIENCES
(2019)
Article
Engineering, Chemical
Srbislav Genic, Branislav Jacimovic
CHEMICAL ENGINEERING PROGRESS
(2018)
