Article
Energy & Fuels
S. Eiamsa-ard, W. Changcharoen, R. Beigzadeh, P. Eiamsa-ard, K. Wongcharee, V. Chuwattanakul
Summary: The experimental study showed that heat transfer intensification can be achieved by inserting multiple twisted-tape bundles into tubes, with increasing number of tapes leading to higher heat transfer rates and friction factors, while increasing twist ratio leading to decreased heat transfer performance. Counter-swirl flow twisted tape sets provided higher thermal hydraulic performance compared to co-swirl flow sets under similar operating conditions.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Thermodynamics
V. Chuwattanakul, K. Wongcharee, P. Ketain, S. Chamoli, C. Thianpong, S. Eiamsa-ard
Summary: An experimental investigation on the aerothermal performance of a heat exchanger tube equipped with newly designed broken V-ribbed twisted tapes (B-VRT) was conducted. The results showed that the B-VRT provided enhanced heat transfer due to increased mixing caused by longitudinal vortices from the ribs and swirling flow from the twisted tapes. The B-VRT with forward facing ribs at an attack angle alpha of 45 degrees exhibited the best performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Boonsong Samutpraphut, Smith Eiamsa-ard, Varesa Chuwattanakul, Chinaruk Thianpong, Naoki Maruyama, Masafumi Hirota
Summary: This article explores the use of sawtooth twisted tapes to enhance heat transfer rate by generating swirling flow and interrupted flowing disturbance. The effects of sawtooth angles on heat transfer rate, friction factor, and aerothermal performance index are analyzed. The results show that the sawtooth twisted tape improves heat transfer rate and introduces varying levels of pressure loss based on the sawtooth angles. The recommended sawtooth twisted tape outperforms the typical twisted tape and plain tube in terms of Nusselt number.
Article
Thermodynamics
Toygun Dagdevir, Mahmut Uyanik, Veysel Ozceyhan
Summary: Experimental investigation on heat transfer enhancement using various twisted tape inserted tube configurations under turbulent flow conditions. Results show that DTTEs have better heat transfer performance compared to PTTEs, while PTTEs have less friction loss.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Pongjet Promvonge, Sompol Skullong
Summary: The article experimentally studied the improved thermal-hydraulic performance in a constant heat-fluxed tube inserted with V-winglet-attached twin counter-twisted tapes. Results showed that the V-winglet-attached twin counter-twisted tapes considerably increased friction loss and Nusselt number, indicating good thermal-hydraulic performance.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Chao Luo, KeWei Song
Summary: The novel twisted annulus design in a double-tube heat exchanger shows excellent thermohydraulic performance, significantly enhancing heat transfer efficiency. The results demonstrate the generation of strong secondary flow within the twisted annulus, leading to a significant improvement in heat transfer effectiveness.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Mechanical
Chen Sun, Wei Wang, Xi-Wei Tian, Xu Zeng, Si-Hao Qian, Yan-Zhao Cai, Xiao-Hui Wang
Summary: This study proposes a parametric modeling method for perforated twisted tapes (PTTs) combined with multi-objective optimization to enhance heat transfer within flow channels. The method considers the influence of structures on hydrothermal performance and speeds up the development process. Numerical results demonstrate the effectiveness and advantages of this approach.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Thermodynamics
Mohammad Mahdi Tafarroj, Golnaz Zarabian Ghaeini, Javad Abolfazli Esfahani, Kyung Chun Kim
Summary: The current study used artificial neural network modeling to analyze the Nusselt number and friction factor of a heat exchanger with twisted tapes, showing that the model performed exceptionally well in terms of time and cost, and accurately predicted heat transfer enhancement based on the specification parameters of the cuts.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
H. Harish, K. Manjunath
Summary: This research compares the flow and heat transfer properties of water with circular protruded twisted-tape inserts to those with traditional twisted tapes. The study found that circular protruded twisted-tape inserts provide higher thermal enhancement and lower friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Mohammad Abbaszadeh, Mohammad Hossein Montazeri, Mojtaba Mirzaie
Summary: This study proposes a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance heat transfer rate without compromising thermal efficiency. The study numerically investigates the effect of different geometrical configurations on heat transfer improvement and performance factor. The results suggest that implementing twisted tape in wavy tubes significantly increases heat transfer rate and performance factor.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
Article
Nuclear Science & Technology
Tenglong Cong, Bicheng Wang, Hanyang Gu
Summary: This article presents a numerical analysis of sCO2 heat transfer deterioration and the heat transfer enhancement of twisted tape. The results indicate that adding twisted tape can effectively suppress the heat transfer deterioration and the enhancement is more significant with a smaller twist ratio.
NUCLEAR ENGINEERING AND DESIGN
(2022)
Article
Thermodynamics
Toygun Dagdevir, Veysel Ozceyhan
Summary: The effects of different twisted tapes on heat transfer and flow characteristics in a heat exchanger tube were experimentally investigated to enhance performance. Results showed that twisted tape inserts improved heat transfer performance, with the novel dimpled twisted tape insert providing the best performance. Addition of ethylene glycol did not significantly increase the friction factor, and higher ethylene glycol content led to decreased thermo-hydraulic performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Review
Green & Sustainable Science & Technology
Mohamed H. Mousa, Nenad Miljkovic, Kashif Nawaz
Summary: Enhancing heat transfer between fluids and walls is crucial for improving performance. By utilizing features that enhance heat transfer, equipment size can be reduced, costs minimized, and safety risks mitigated.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Thermodynamics
Parimesh Joshi, Anil Kumar Patil, Manoj Kumar
Summary: The application of twisted tape fins (TTFs) significantly enhances the heat flux in pool boiling. This study experimentally investigates the effect of solid and perforated TTFs on pool boiling of water, and finds that an arrangement of five TTFs with a twist ratio of 3 shows an 18.6% enhancement compared to a plain surface arrangement, while an arrangement of five perforated TTFs with a perforation index of 7 and twist ratio of 3 shows a maximum enhancement of 28.7%.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Thermodynamics
Ravikiran Balaga, Ramji Koona, Subrahmanyam Tunuguntla
Summary: The impact of various variables on thermal conductivity and rheological behavior, such as nanoparticle weight concentration and temperature, as well as the cumulative effects of wire coil insert and twisted tape on heat transfer coefficient and friction factor characteristics, is explored. The findings show that higher content of nanoparticles increases heat transfer as well as pressure drop.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
C. Thianpong, K. Wongcharee, H. Safikhani, S. Chokphoemphun, A. Saysroy, S. Skullong, S. Eiamsa-ard
Summary: This study utilized a hybrid technique involving TiO2/water nanofluid and loose-fit delta-wing twisted tape to enhance heat transfer efficiency. Experimental results showed that the combined enhancement technique significantly improved heat transfer rates, mainly due to the swirling flow effect and higher thermal conductivity. Furthermore, reducing the loose-fit ratio and increasing the nanofluid concentration can also enhance heat transfer rates and thermohydraulic performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
S. Eiamsa-ard, A. Suksangpanomrung, P. Promthaisong
Summary: This study presents a numerical analysis of heat transfer mechanism and flow topology of channels with V-shaped baffles (VB) and semi-circular hinged V-shaped baffles (SH-VB). The results show that SH-VB provides higher heat transfer enhancement and lower pressure losses compared to VB. The optimum parameters for maximum thermal enhancement factor (TEF) are BR = 0.10, PR = 0.5 and beta = 10 degrees.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
V. Chuwattanakul, K. Wongcharee, M. Pimsarn, S. Chokphoemphun, S. Chamoli, S. Eiamsa-ard
Summary: The effect of conical air distributors on the drying of peppercorns in a fluidized bed dryer was experimentally studied. The results showed that air distributors with specific parameters exhibited better drying performance, and increasing the air velocity accelerated the drying process. Additionally, a neural network model was constructed to predict the moisture content of peppercorns.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Smith Eiamsa-Ard, Arnut Phila, Monsak Pimsarn, Naoki Maruyama, Masafumi Hirota
Summary: The aim of this study is to investigate the effect of wing position on heat transfer rate and pressure drop characteristics in a channel with square-wing perforated transverse baffles. Two types of baffles, solid and square-wing, were tested at various Reynolds numbers. The results showed that square-wing baffles have lower pressure losses and higher thermal performance compared to solid baffles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Pongjet Promvonge, Arnut Phila, Varesa Chuwattanakul, Suriya Chokphoemphun, Smith Eiamsa-ard, Naoki Maruyama, Masafumi Hirota
Summary: In this study, the use of arc-shaped twisted-baffles (T-ABs) in a rectangular air channel was experimentally investigated to improve the thermal performance factor (TPF). The effects of pitch ratio (p/w), arc-shape angle (alpha), and Reynolds number (Re) were explored. The results showed that the channel with arc-shaped twisted-baffles achieved higher Nusselt numbers compared to a smooth channel, likely due to the presence of multiple-impinging jets near the surface. Baffles with larger attack angles exhibited superior heat transfer enhancements. The optimal condition was found at alpha = 90o, p/w = 4.0, and Re = 4000, resulting in significant improvements in heat transfer rate, friction factor, and TPF.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
V. Chuwattanakul, K. Wongcharee, P. Ketain, S. Chamoli, C. Thianpong, S. Eiamsa-ard
Summary: An experimental investigation on the aerothermal performance of a heat exchanger tube equipped with newly designed broken V-ribbed twisted tapes (B-VRT) was conducted. The results showed that the B-VRT provided enhanced heat transfer due to increased mixing caused by longitudinal vortices from the ribs and swirling flow from the twisted tapes. The B-VRT with forward facing ribs at an attack angle alpha of 45 degrees exhibited the best performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Smith Eiamsa-ard, Arnut Phila, Khwanchit Wongcharee, Monsak Pimsarn, Naoki Maruyama, Masafumi Hirota
Summary: The influences of perforated-baffles on local Nusselt number and thermo-hydraulic behaviors were comprehensively studied using thermochromic liquid crystal sheet. The study found that perforated-baffle with square wings offered better results compared to regular perforated-baffles, and caused less pressure loss.
Article
Energy & Fuels
Prachya Samruaisin, Rangsan Maza, Chinaruk Thianpong, Varesa Chuwattanakul, Naoki Maruyama, Masafumi Hirota, Smith Eiamsa-ard
Summary: The influences of V-shaped delta-wing baffles on the thermohydraulic performance in a round tube were experimentally tested. The V-shaped delta-wing baffles with a set number of wings (N=4, 6, and 8) and various pitch ratios (P/D=2.0, 2.5, and 3.0) were studied. The results showed that the V-shaped delta-wing baffles can significantly enhance the Nusselt number and improve the heat transfer rate.
Article
Thermodynamics
S. Sirikasemsuk, N. Naphon, S. Eiamsa-ard, P. Naphon
Summary: The operating temperature of the battery has a significant impact on the performance, reliability, and safety of electric vehicles. A 3D Eulerian model is used to study the battery's thermal behavior under different coolant flow directions. The results show that the coolant flow direction and thermophysical properties have a significant effect on the maximum operating temperature and temperature gradient of the battery. The proposed battery nanofluid cooling pack can optimize the thermal management system of electric vehicle packs.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Pongjet Promvonge, Smith Eiamsa-ard, Sompol Skullong, Naoki Maruyama, Masafumi Hirota
Summary: An experiment was conducted to investigate the effectiveness of inserting a louver-punched trapezoidal-winglet into a heat-fluxed tube to create a longitudinal vortex generator. The study aimed to optimize thermal performance and reduce heat exchanger sizes. The experimental results showed significant improvements in friction factor and Nusselt number compared to a plain tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Smith Eiamsa-ard, Naoki Maruyama, Masafumi Hirota, Sompol Skullong, Pitak Promthaisong
Summary: This paper investigates the fluid flow and heat transfer mechanisms in ribbed twisted-oval tubes. Simulations were conducted to find the optimal conditions for uniform heat-flux wall condition in turbulent flow. The results show that the ribbed twisted-oval tubes generate stronger swirl flow and have higher turbulent kinetic energy compared to conventional twisted-oval tubes. With increasing rib height ratios, spiral depth ratios, and number of ribs, the turbulent kinetic energy increases significantly while it decreases with larger twist pitch ratios. The optimal parameters for maximal thermal performance factor (TPF) of 1.32 were found to be a twist pitch ratio of 3.5, a spiral depth ratio of 0.1, a rib height ratio of 0.075, a number of ribs of 4, and a Reynolds number of 5000.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
K. Nanan, S. Eiamsa-ard, S. Chokphoemphun, Manoj Kumar, M. Pimsarn, V. Chuwattanakul
Summary: The aim of this study was to investigate the shrimp drying process in a fluidized-bed dryer in order to develop a more efficient method compared to traditional sun drying. The influence of shrimp size, bed height, and air temperature on the drying rate was studied, with the moisture content of boiled shrimp decreasing at higher drying temperatures. Reducing bed height and shrimp size both increased shrimp moisture removal. The highest dried shrimp production rate was achieved at a bed height of 1.0 and drying temperature of 80 degrees C.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Arnut Phila, Warin Keaitnukul, Smith Eiamsa-ard, Paisarn Naphon, Naoki Maruyama, Masafumi Hirota, Varesa Chuwattanakul
Summary: The proper designs of modified heat transfer surfaces or turbulence enhancement inserts are crucial for improving the efficiency of thermal systems. The use of transverse baffles with rectangular notches can effectively enhance heat transfer while minimizing pressure loss. The smaller the ratio of notch height to baffle height, the higher the heat transfer enhancement, friction factor, and aerothermal performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Aerospace
P. Eiamsa-ard, K. Wongcharee, K. Kunnarak, M. Kumar, S. Eiamsa-ard, M. Pimsarn
Summary: Thermal visualization was performed to study and compare the heat transfer behavior of different types of jets. The results showed that the swirling impinging jet with a triple spiral-corrugated nozzle and twisted tape inserts had stronger recirculation, leading to reduced heat transfer between the stagnation region and surroundings.
THERMOPHYSICS AND AEROMECHANICS
(2022)
Article
Engineering, Aerospace
S. Eiamsa-ard, V Chuwattanakul, H. Safikhani, P. Promthaisong
Summary: In this paper, multi-objective optimization of geometric parameters of spirally-cross-corrugated (SCC) tubes is carried out using numerical methods, genetic algorithms, and artificial neural networks. The analysis reveals several important optimal design principles for heat transfer in such tubes.
THERMOPHYSICS AND AEROMECHANICS
(2022)