The Impact of Circular Holes in Twisted Tape Inserts on Forced Convection Heat Transfer

Journal of Mines Metals and Fuels, Journal Year: 2024, Volume and Issue: unknown, P. 1005 - 1012

Published: Oct. 16, 2024

This study investigated heat transfer and friction characteristics in a forced convection system using wavy twisted tape inserts with circular holes. The inserts, twist ratios (TR) of 8.5, 7.5, 6.5, were placed inside test pipe to create turbulent flow. tapes measured 700 mm length 18 width, while the had an outer diameter 35 inner 30 mm, section mm. Airflow rates adjusted achieve different bulk mean temperatures. Experimental data used develop new correlations for Nusselt number factor. Reynolds (Re) ranged from 4,000 14,000. Comparisons between varying pitches smooth tube showed that highest rate was achieved ratio 6.5.

Language: Английский

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Enhancement in Heat Transfer with Nanofluids in Double-Pipe Heat Exchangers

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 165 - 172

Published: Jan. 7, 2025

This study investigates the potential of using nanofluids, specifically those composed water and Titanium Dioxide (TiO2) nanoparticles, to enhance thermal performance a double-pipe copper heat exchanger. By incorporating varying concentrations TiO2 nanoparticles (0.1%, 0.3% 0.5%) into water, researchers aimed improve fluid's conductivity viscosity. The experimental results demonstrated that addition led significant increase in overall transfer rate. highest rate was achieved at nanoparticle concentration 0.3%, indicating an optimal balance between enhanced properties flow resistance. However, slight decrease observed 0.5%, suggesting higher may not necessarily lead further improvements. revealed substantial 23% improvement efficiency exchanger when nanofluid. enhancement is attributed improved nanofluid, which allows for more efficient hot cold fluids. In conclusion, findings this research strongly suggest TiO2/water nanofluids can significantly exchangers. carefully optimising conditions, it possible achieve gains while minimising drawbacks such as increased pressure drop. Major Findings: explored use transfer, with leading efficiency. concentrations, improving conductivity, drop, potentially offsetting benefits.

Language: Английский

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Integrated Approach to Enhance Vehicle Safety: A Novel Bumper Design with Energy-Absorbing Mechanisms

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 27 - 35

Published: Jan. 7, 2025

This research focuses on improving vehicle safety by developing a new spring-based energy absorption system for the front bumper of Bolero vehicle. The goal is to reduce severity frontal collisions absorbing significant portion impact energy. proposed comprises helical compression spring, mounting bracket, and chassis member. design aims absorb 30-35% impact, reducing deceleration rate minimizing shock transmitted passenger cabin. To visualize estimate its capabilities, 3D CAD model analytical calculations have been performed. Further analysis using finite element methods will provide more detailed understanding deformation behaviour as well capacity absorbing. Future work involve refining design, conducting analysis, evaluating performance through rigorous testing. has potential significantly enhance mitigate risks associated with collisions. Major Findings: A novel was 30-35 %. Finite conducted assess system's capacity. four-damper demonstrated 42.44% reduction in maximum compared plain bumper. safety.

Language: Английский

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State-of-the-Art Cooling Solutions for Electronic Devices Operating in Harsh Conditions

Journal of Mines Metals and Fuels, Journal Year: 2024, Volume and Issue: unknown, P. 843 - 861

Published: Sept. 27, 2024

The ongoing push for miniaturization and increased computational power in electronic devices has intensified thermal management challenges, especially harsh environments with extreme heat, moisture, vapour, dust, vibration. This paper provides a comprehensive analysis of both direct indirect cooling methods, focusing on heat transfer efficiency, optimization techniques, practical applications. It emphasizes the critical importance maintaining performance, reliability, durability systems under tough conditions. review explores advanced materials technologies, including role Thermal Interface Materials (TIMs) prolonging lifespan Integrated Circuits (ICs) use Phase Change (PCMs) substrate boards versatile management. also discusses effectiveness Liquid Cold Plates battery module potential micro-channel liquid Switching Mode Power Supplies (SMPS) boards. By offering detailed insights into design principles, guides engineers optimizing IC chip placement improving system reliability. Additionally, it examines evolution traditional rise innovative techniques like thermoelectric cooling, impact advancements materials, design, manufacturing energy efficiency environmental sustainability. highlights promising research areas emerging contributing to development more efficient, reliable, eco-friendly solutions environments.

Language: Английский

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Enhancing Smartphone Circuit Cooling: A Computational Study of PCM Integration

Journal of Advanced Research in Numerical Heat Transfer, Journal Year: 2024, Volume and Issue: 27(1), P. 132 - 145

Published: Nov. 30, 2024

Modern smartphones are used for a wide range of demanding tasks, such as gaming, high-resolution photography, and internet browsing, which significantly increases their power consumption. This excessive use leads to higher heat generation within the device, typically between 2 6 watts. To manage this maintain optimal performance, employ various cooling techniques. A new mobile method could innovative approaches like advanced phase change materials, liquid systems, or emerging technologies thermoelectric microfluidic cooling. paper proposes using materials. approach leverages material's ability absorb by transitioning from solid state vicecersa. helps keep device's temperature below 45 degrees Celsius. In mid-range smartphones, methods natural convection, indirect heat-pipe cooling, forced convection commonly used, but these often fail under high-power usage conditions.

Language: Английский

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Influence of Plate Thickness on the Mechanical Behaviour of Mild Steel Curved Plates: An Experimental Study

Journal of Mines Metals and Fuels, Journal Year: 2024, Volume and Issue: unknown, P. 1319 - 1327

Published: Dec. 11, 2024

This paper aims to investigate the influence of plate thickness on strength, failure load and deformation behaviour mild steel curved plates. Experimental tests were conducted plates with varying thicknesses, subjected static loading conditions. The ultimate load, deflection modes recorded analysed. Results indicate a significant relationship between mechanical properties. Thicker exhibited higher load-carrying capacity different patterns than thinner Major Finding: findings provide valuable insights for designing optimising structures in various engineering applications.

Language: Английский

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Effectiveness of Coconut Shell Ash for Corrosion Control in Concrete – An Experimental Approach

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 419 - 427

Published: Feb. 24, 2025

This study evaluates the performance of coconut shell ash as a corrosion-controlling agent in concrete. Reinforced concrete specimens with different dosages were cast and further exposed to an accelerated corrosion process. The activity was monitored help most commonly adopted electrochemical techniques viz - half-cell potential Tafel extrapolation technique. test results indicated that adding 5% by weight cement hindered resulted decreased rate. compressive strength also enhanced compared without ash. Thus, using additive can be considered eco-friendly solution it helps resolve issue disposal agricultural waste material controls Major findings: experimental indicate incorporating Coconut Shell Ash (CSA) into effectively reduces enhances strength. As byproduct, CSA offers environmentally friendly for while mitigating

Language: Английский

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Harnessing the Power of Plastic Waste: A Sustainable Approach to Fuel Production

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 467 - 473

Published: Feb. 24, 2025

The rapid pace of economic growth has placed immense strain on our planet's resources. Our current reliance fossil fuels, such as oil, gas, and coal, is unsustainable poses significant environmental risks. Fortunately, a multitude renewable energy alternatives, including biomass, hydropower, wind energy, offer promising solutions. In addition to production, effective waste management crucial. surge in industrial consumer activity led dramatic increase generation, particularly plastic waste. widespread use plastics, due their versatility affordability, resulted global crisis. 2019 alone, staggering 299 million tons were produced worldwide, from previous years. Despite recycling efforts, substantial amount ends up landfills oceans, causing severe damage. It estimated that between 10 20 pollute oceans annually, leading the accumulation over 5 trillion particles. project aims address this pressing issue by developing sustainable solution convert into valuable biofuel. Through process known pyrolysis, we can extract oil diesel unsorted dirty plastic, producing product called Plastic Pyrolyzed Oil (PPO). This biofuel be sold at competitive prices, making it viable alternative traditional fuels. Both plastics petroleum-derived fuels are primarily composed hydrocarbons, them chemically similar. By harnessing power break down its constituent components clean-burning fuel. offers several advantages disposal methods, incineration. Pyrolysis non-toxic environmentally friendly, requiring minimal pre-treatment by-products. Major Findings: 1. pollution crisis: excessive production improper pose threat environment, marine ecosystems. 2. Dependence fuels: continued contributes climate change air pollution. 3. Potential plastic-derived Converting fuel through processes like pyrolysis both production.

Language: Английский

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Passive Cooling of EV Batteries Using Phase Change Material: A Simulation Study

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 447 - 454

Published: Feb. 24, 2025

The escalating global concerns regarding environmental degradation and climate change are accelerating the shift towards renewable energy sources. Traditional gas-powered vehicles, significant contributors to air pollution warming being increasingly replaced by Electric Vehicles (EVs) as a more sustainable transportation solution. However, one challenge associated with EVs is thermal management of their batteries. To address this issue, study employed computer simulations evaluate passive cooling system for EV batteries, utilising special material known Phase Change Material (PCM). system's performance was assessed under three different power discharge rates. results demonstrated that PCM-based effectively reduced maximum temperature increase in battery 1-2% compared an unprotected battery. This indicates efficiently dissipates heat from battery, thereby improving its overall lifespan. Major Findings: 1. Effective Thermal Management: demonstrates effectiveness reducing rise lithium-ion cells, particularly high 2. Improved Battery Performance Lifespan: By dissipating heat, PCM contributes improved extended 3. Potential Parallel Cell Configurations: suggests parallel cell configurations may offer superior series configurations, although further research needed validate finding.

Language: Английский

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Investigating the Impact of Oxygenated Additives on Exhaust Emissions from Unleaded Gasoline Vehicles

Journal of Mines Metals and Fuels, Journal Year: 2025, Volume and Issue: unknown, P. 333 - 344

Published: Feb. 24, 2025

The rapidly increasing global population, combined with a corresponding increase in power plants, factories and automobiles, has led to significant decline air quality. This issue first came the forefront Los Angeles basin during late 1940s, primarily due region's high population density unique meteorological conditions. combination of industrial vehicular emissions prevalent fog resulted formation smog. In response this growing concern, California began implementing emission standards 1960s. Researchers have explored various methods mitigate from internal combustion engines. One such approach involves utilisation oxygen-containing additives enhance gasoline performance reduce harmful emissions. study aims determine potential Dimethyl Carbonate (DMC) as an additive reducing To achieve objective, experimental setup was established using multi-cylinder, four-stroke spark ignition engine test fuel blends containing DMC. Major Findings: findings investigation revealed that blended DMC exhibits lower levels Carbon Monoxide (CO) Hydrocarbon (HC) compared standard unleaded gasoline. However, impact on Nitrogen Oxide (NOx) appears be negligible.

Language: Английский

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