Enhancing heat transfer and minimizing entropy generation with mono and hybrid nanofluids: An experimental study

Applied Thermal Engineering, Год журнала: 2024, Номер unknown, С. 124417 - 124417

Опубликована: Сен. 1, 2024

Язык: Английский

---

Simulation and Optimization of Finned and Twisted Double‐Tube Heat Exchanger Using Neural Network Algorithm

Heat Transfer, Год журнала: 2025, Номер unknown

Опубликована: Фев. 10, 2025

ABSTRACT Creating a high heat transfer flux is not common phenomenon and occurs only when source of production (or consumption) placed in small volume; precision casting systems, should be done at velocity due to the presence thin molten branches. Nanofluids present significant opportunity improve thermal efficiency. In this research, combination different solutions enhance has been evaluated simultaneously. For purpose, current aluminum oxide non‐Newtonian nanofluid volume percentages 0, 0.5, 1.5, 2 investigated torsional exchanger with rotating triangular blade around tube. The base fluid consists water 0.1% mass carboxymethyl cellulose. study's results, exchanger's performance predicted. Combining neural network optimization code numerical simulation double‐tube spiral geometry using increase innovation research.

Язык: Английский

---

Performance analysis of a single-turn heat pipe with nanofluids: effects of non-dimensional numbers and fill ratio

Heat and Mass Transfer, Год журнала: 2025, Номер 61(4)

Опубликована: Апрель 1, 2025

Язык: Английский

---

EXPERIMENTAL INVESTIGATION OF ENERGY CONVERSION EFFICIENCY USING NANOFLUIDS IN MINI-CHANNEL HEAT EXCHANGER

Case Studies in Thermal Engineering, Год журнала: 2025, Номер unknown, С. 106198 - 106198

Опубликована: Апрель 1, 2025

Язык: Английский

---

Enhancing heat pipe efficiency using silver nanomaterial nanofluids: a hybrid approach with carbon nanotubes, graphene, and quantum Dot-MOS compositions

Matéria (Rio de Janeiro), Год журнала: 2025, Номер 30

Опубликована: Янв. 1, 2025

ABSTRACT Heat pipes, known for their high efficiency and reliability, are widely used in these systems, but performance is dependent on the thermal properties of working fluid. Traditional coolants have limitations, prompting exploration nanofluids—suspensions nanoparticles base fluids—to enhance performance. This study investigates effect silver nanomaterial-based nanofluids with distinct morphologies—nanospheres nanocubes—along hybrid compositions incorporating carbon nanotubes, graphene, quantum dot-metal oxide semiconductors (QD-MOS). Using an experimental approach, evaluates heat transfer coefficients, efficiency, TR across varying concentrations power inputs. Response Surface Methodology (RSM) machine learning techniques were employed optimization. Results indicate that nanosphere-based HTC by 38% compared to DI water, while nanofluids, particularly Ag-Graphene, achieve a 47% improvement. significantly reduced, nanocube-based fluids performing better at higher These findings highlight potential tailored nanofluid formulations pipe industrial applications.

Язык: Английский

---

An Experimental Approach to Minimize Entropy Generation in the Flow Condensation Inside a Horizontal Pipe

Heat Transfer, Год журнала: 2025, Номер unknown

Опубликована: Май 8, 2025

ABSTRACT The experimental investigation focuses on the two‐phase flow of nanorefrigerant in a straight tube. vision study is to investigate irreversibility proposed system because frictional effects and heat transfer rate, as well understand Bejan number extent exergy destruction. studies were conducted under certain conditions, involving mass about 200–500 kg/m 2 s, vapor quality 0.01 0.9, nanoparticle volume fractions 0.01%, 0.05%, 0.1%, saturation temperature 40.9°C. results suggest that higher levels quality, flow, MWCNT concentration are associated with reduced entropy creation related increased formation due pressure during process condensation. While increases, net ultimately decreased it attributed considerable drop through transfer, comparison increase generation friction. system's loss when nanofluid utilized. utilization R123‐MWCNTs significant destruction around 27%.

Язык: Английский

---

Effects of tapered helical obstacles on heat transfer in tubes

Chemical Product and Process Modeling, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Abstract In this computational investigation, the effects of helical tapering barriers on turbulent air flow through a horizontal circular tube with constant surface heat flux were examined. The goal was to improve thermal performance and transfer. Multiple configurations examined using SST k - ϋ turbulence model in ANSYS Fluent 2023. These included two heights (2.5–5 mm, 2.5–7.5 mm) helix ratios ( y = 2, 3, 4), Reynolds numbers ranging from (10,000 60,000). At Re 10,000, configuration height 2.5–5 mm 2 produced greatest Nusselt number 333, which is 151 % higher than plain (Nu 36). This achieved due installation barriers, considerably boosted transport, nevertheless, comparison tube, friction factor increased by 82 modification. Reducing ratio or further enhanced both metrics, increasing while decreasing factor. All (TPF) greater one, even resistance; that most enhancement had highest TPF 1.62. particular, for low heights, our results demonstrate tapered obstacles are helpful enhancing performance.

Язык: Английский

---

Analysis of heat transfer characteristics and optimization of variable-direction twisted oval tubes with inserts

International Journal of Thermal Sciences, Год журнала: 2024, Номер 210, С. 109661 - 109661

Опубликована: Дек. 24, 2024

Язык: Английский

---