Article
Thermodynamics
A. Ali Rabienataj Darzi, Mohamad Abuzadeh, Mohamad Omidi
Summary: This study numerically investigates the efficiency of using helical-coiled tubes with corrugated walls. It explores the impact of Reynolds number, tube diameter, corrugated height, and pitch on heat transfer and pressure drop, and found that higher corrugated height and lower corrugated pitch enhance heat transfer with increased friction factor. Additionally, a Nusselt number correlation is developed based on numerical results, showing a stronger dependence on corrugated height compared to corrugated pitch.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(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
Mechanics
Hassan Hajabdollahi, Sajjad Shamsi, MohammadShafiey Dehaj, Masoud Salarmofrad, Mohsen Rezaeian
Summary: This paper investigates the thermo-hydraulic analysis of a diamond-shaped turbulator in a tube using numerical simulation, presenting closed form correlations for Nusselt number and friction factor with respect to Reynolds number. The study reveals the optimal parameters for the turbulator design and demonstrates significant improvement in efficiency and reduction in friction factor by adjusting the parameters.
Article
Thermodynamics
Kim Leong Liaw, Jundika C. Kurnia, Agus P. Sasmito
Summary: This study investigates the convective heat transfer performance of Newtonian fluid in a helical twisted multilobe tube using computational fluid dynamics (CFD) simulations. The results show that the combination of number of lobes and tube twisting has a significant effect on the heat transfer coefficient, while increasing the number of lobes alone has a minimal impact. The helical coiled tube outperforms the straight tube within a certain range of Reynolds numbers, while twisting is recommended primarily for straight tubes.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Tushar Adgale, Prabhakar Zainith, Niraj Kumar Mishra, Anshul Sharma
Summary: This study experimentally investigated the Nusselt number, friction factor, and thermal performance factor of triangular helical strip inserts. The results showed that the heat transfer and thermal performance of the helical inserted tube were significantly improved compared to a plain tube. The Nusselt number was higher for inserts with smaller widths and tighter pitches, while the friction factor was lower for inserts with higher pitches and higher for inserts with larger widths. The thermo-hydraulic performance of the helical strip insert improved with a higher number of passes, smaller widths, and tighter pitches.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Green & Sustainable Science & Technology
Haci Parlamis, Ekrem Ozden, Mahmut Sami Buker
Summary: Experimental testing of a PTAC with helical screw tape insertion showed significant improvement in efficiency and heat transfer performance. The temperature rise improvement ranged from 56% to 71%, validating the potential of helical screw tape insert in enhancing heat exchange.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Kim Leong Liaw, Jundika C. Kurnia, Agus P. Sasmito
Summary: This study investigated the effect of inserting twisted tape into a helical tube on turbulent heat transfer, finding that the insertion of twisted tape increases the intensity of secondary flow in the radial direction, resulting in higher heat transfer performance. The results also showed that for all cases, higher inlet Reynolds numbers lead to a proportional increase in heat transfer, while the friction coefficient decreases with decreasing decrement amounts.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
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)
Review
Green & Sustainable Science & Technology
Younus Hamoudi Assaf, Abdulrazzak Akroot, Hasanain A. Abdul Wahhab, Wadah Talal, Mothana Bdaiwi, Mohammed Y. Nawaf
Summary: Research focuses on improving the thermal conductivity of heat exchangers by using different strategies such as inserting tapes and rings of various shapes, as well as transforming fluids into nanoliquids with nanomaterials. Factors such as torsion tape ratio, ring spacing, and flow direction impact heat transfer efficiency.
Article
Energy & Fuels
Prashant Kumar, R. M. Sarviya
Summary: This paper focuses on enhancing heat transfer and thermal performance factor of tubular heat exchanger by using a novel Perforated Rectangular Cut Twisted Tape (PRCTT) and compares it with other types of twisted tapes. The analysis includes different aspects such as Nusselt number, friction factor, and perforation ratio. The results show significant enhancements in Nusselt number and thermal performance when using the PRCTT, especially in the turbulent zone. The perforation of the tape further decreases the friction factor and improves the overall thermal performance factor.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Energy & Fuels
Shashank Ranjan Chaurasia, R. M. Sarviya
Summary: Heat transfer enhancement is crucial for heat exchangers, and the use of double strip helical screw tape inserts (DS-HST) has been shown to be effective in increasing heat transfer. Experimental results demonstrated that DS-HST inserts achieved better heat transfer enhancement compared to single strip helical screw tape inserts (SS-HST) at lower twist ratios. The findings suggest that DS-HST inserts are suitable for reducing the size of heat exchangers or thermal applications while utilizing energy resources and reducing environmental pollution.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Thermodynamics
Manoj Kumar Diwaker, Arvind Kumar
Summary: The present study quantifies the combined effect of triangular cut and semicircular cuts on twisted tape inserts (TSCTT) of DPHE in turbulent flow. Various triangular cuts (B/Y = 0.5, 0.8, and 1.1) were made on the neutral axis, along with semicircular cuts of different diameters (4 mm, 6 mm, and 8 mm) on the twisted tape. The Internet of Things (IoT) approach was utilized to minimize errors and automate measurement of input and output characteristics. The results show significant improvements in thermohydraulic performance metrics, with TSCTT achieving competitive enhancement in Nusselt number and friction factor.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Seyedmahmood Kia, Shoaib Khanmohammadi, Ali Jahangiri
Summary: In this study, the heat transfer and pressure drop properties of Al2O3 and SiO2/Base oil nanofluid flow in a helical tube were investigated numerically and experimentally. The impact of various parameters, including flow Reynolds number, fluid temperature, nanoparticles, and weight concentrations, on the heat transfer factor and pressure drop was analyzed. The results showed that nanofluid enhanced the heat transfer factor and pressure drop compared to the base fluid. The Al2O3 nanofluid exhibited higher heat transfer coefficient than the SiO2 nanofluid. The maximum heat transfer rate was achieved with 0.5% mass concentrations of Al2O3 and SiO2 nanofluids. The helical tube geometry improved heat transfer by 19.5%, and reducing helical pitch and pitch circle diameter further enhanced the heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Review
Green & Sustainable Science & Technology
Yadaba Mahanand, Jnana Ranjan Senapati
Summary: This article reviews the methods and effects of improving the heat transport rate through a solar air heater duct by inserting roughness geometry on the collector plate's heat transfer surface, and provides some optimal parameters and types of roughness geometry.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Saadah Ahmad Sowi, Shahrir Abdullah, Kamaruzzaman Sopian
Summary: The study introduced a new innovative twisted tape with linearly increasing/decreasing pitch ratio combined with different nanofluids. Among the different geometries, TT LIPR 0.25 showed the highest turbulent kinetic energy value. TT LIPR was found to be the best choice under turbulent flow regime with Reynolds number >10,000, creating higher overall enhancement ratio compared to other geometries.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Review
Thermodynamics
Cyril Reuben Raj, S. Suresh, R. R. Bhavsar, Vivek Kumar Singh
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
K. P. Venkitaraj, B. Praveen, Harjit Singh, S. Suresh
APPLIED THERMAL ENGINEERING
(2020)
Article
Chemistry, Physical
S. Sargunanathan, K. Ramanathan, S. Tharves Mohideen, S. Suresh
INTERNATIONAL JOURNAL OF PHOTOENERGY
(2020)
Article
Thermodynamics
Solaimalai Raja Rakkappan, Suresh Sivan, B. Praveen, M. Naarendharan, P. Sai Sudhir
Summary: This study measured the heat of dissociation of tetra-n-butyl ammonium bromide semi-clathrate hydrates, as well as the thermal conductivity and specific heat of TBAB aqueous solutions and solidified solutions for various weight fractions. The experiment showed that diameter and wall temperature influenced charging and discharging performance, with higher diameter capsules providing better performance.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Chemistry, Physical
Solaimalai Raja Rakkappan, Suresh Sivan, Vignesh Pethurajan, A. Aditya, Harshit Mittal
Summary: This study focused on improving the performance of heat transfer fluid system by utilizing encapsulated phase change material slurries (EPCMS), particularly analysing the potential usage of low-cost organic PCM 1-Decanol encapsulated in urea-formaldehyde shell (UFS). The prepared discrete and uniformly shaped EPCM capsules and modified EPCMM with nanoparticles showed enhanced thermal response, with SEM analysis indicating different surface morphologies based on the type of nanoparticles used. Experimental results proved that EPCMM with 6 wt% GnP and 10 wt% CuO exhibited the most suitable thermal characteristics, demonstrating its applicability in low-temperature heat transfer fluid applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Cyril Reuben Raj, S. Suresh, Sudharshan Vasudevan, M. Chandrasekar, Vivek Kumar Singh, R. R. Bhavsar
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Energy & Fuels
Vikesh Sathyamurthy, Sankar Gopalan, Sivan Suresh, Balasubramanian Karuppudayar Ramaraj, Santhosh Kumar Deenadayalan
Summary: Thermo gravimetric analysis (TGA) is widely used for estimating devolatilization rates and measuring char reactivity in coal. This study found that the most accurate method for analyzing TGA data for high-ash Indian coal is FWO.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Thermodynamics
Mohamed Ibrahim N.H., M. Udayakumar, Sivan Suresh, Suvanjan Bhattacharyya, Mohsen Sharifpur
Summary: This study investigates the insights of soot formation in ethylene/hydrogen/nitrogen diffusion jet flame, including soot volume fraction as a function of flame-normalized length and various soot formation rates. The originality of this study lies in coupling LES turbulent model with chemical equilibrium diffusion combustion and conducting SVF and its insights study for different Reynolds number configurations.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2021)
Article
Thermodynamics
R. Anish, V Mariappan, S. Suresh, Mahmood Mastani Joybari, Ammar M. Abdulateef
Summary: The study investigates the use of thermal energy storage systems to address the intermittence of renewable energy sources, focusing on analyzing the heat transfer efficiency and performance of compact spiral coil thermal storage units. Experimental data shows that in this storage unit, the processes of heat storage and discharge of xylitol are mainly governed by natural convection and conduction, respectively.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Energy & Fuels
Krishnadass Karthick, S. Suresh
Summary: Solar thermoelectric power generation using Alumina Nano-Enhanced Phase Change Material and storing rejected heat in D-Mannitol helps in achieving continuous power output. Experimental results suggest that a composition of 99% D-Mannitol + 1% Alumina nanoparticle is optimal for various heat inputs and cooling methods, resulting in significantly higher TEG electrical power outputs compared to natural cooling methods.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Thermodynamics
Karthik Krishnaswamy, Suresh Sivan
Summary: The power output and efficiency of a gas turbine can be improved by using ribs that generate high Thermal Hydraulic Performance (THP) in cooling passages. Experimental results show that V and W-shaped ribs can effectively enhance heat transfer within a certain range of Reynolds numbers, with optimal performance observed at Reynolds number 40000.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Solaimalai Raja Rakkappan, Suresh Sivan, Shaik Naveed Ahmed, M. Naarendharan, P. Sai Sudhir
Summary: CPCM has a higher freezing temperature (around 4.1 degrees C), zero supercooling, and enhanced energy storage characteristics, ensuring efficient energy storage and recovery.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Energy & Fuels
Cyril Reuben Raj, S. Suresh, Vivek Kumar Singh, R. R. Bhavsar, M. Chandrasekar, V Archita
Summary: This article introduces a synthesized manganese-based layered perovskite Solid-Solid PCM (SS-PCM) homogenized with 5 wt.% of nano-encapsulated liquid gallium-indium metal alloy (n-LMA) for energy storage applications, showing high stability, enhanced thermal conductivity, and increased energy storage performance.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Abhay Lingayat, V. P. Chandramohan, V. R. K. Raju, S. Suresh
Summary: An indirect type solar dryer has been developed and analyzed in terms of its performance and drying kinetics for brinjal and tomato slices. The results show significant drying effects for both brinjal and tomato, with an average effective moisture diffusivity of 3.60 x 10(-9) and 4.00x 10(-9) m(2)/s, respectively.
HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
S. Anand, S. Suresh, R. Dhanuskodi, D. Santhosh Kumar
FRONTIERS IN HEAT AND MASS TRANSFER
(2020)
