PapersFlow Research Brief
Heat Transfer Mechanisms
Research Guide
What is Heat Transfer Mechanisms?
Heat transfer mechanisms are the physical processes by which thermal energy is exchanged between bodies or within a system through conduction, convection, and radiation.
Research on heat transfer mechanisms encompasses 39,140 works with a focus on analysis and enhancement in solar air heaters using experimental investigations, numerical modeling, and correlations for heat transfer and friction factors. Studies examine artificial roughness elements in solar air heater ducts alongside energy and exergy analyses via computational fluid dynamics (CFD). Key contributions include nanofluid enhancements showing higher thermal conductivity and convective heat transfer coefficients compared to base fluids.
Topic Hierarchy
Research Sub-Topics
Convective Heat Transfer in Roughened Solar Air Heater Ducts
Researchers investigate Nusselt number correlations and enhancement mechanisms using artificial roughness elements like ribs and fins in solar air heater channels. Experimental and numerical studies quantify convective coefficients under turbulent flow conditions.
Friction Factor Correlations in Artificially Roughened Channels
Studies develop empirical correlations for friction factors in solar air heater ducts modified with wire ribs, twisted tapes, and other turbulators. Research balances heat transfer gains against increased pressure drops using Darcy friction factor analyses.
CFD Modeling of Turbulent Flow in Solar Air Heaters
Computational fluid dynamics simulations employing k-ε and LES turbulence models predict flow patterns and heat transfer in roughened solar air heater geometries. Validation against experimental data refines boundary conditions and mesh strategies for complex roughness.
Exergy Analysis of Roughness-Enhanced Solar Air Heaters
Exergy-based thermodynamic evaluations assess irreversibilities in heat transfer processes within artificially roughened solar air heaters. Researchers compare exergy efficiencies across rib shapes, aspect ratios, and operating conditions.
Impinging Jet Heat Transfer in Solar Air Heaters
Experimental and numerical research examines heat transfer augmentation via impinging air jets on roughened surfaces in solar air heater configurations. Studies optimize jet Reynolds numbers, nozzle spacing, and surface protrusions for peak Nusselt numbers.
Why It Matters
Heat transfer mechanisms enable performance improvements in solar air heaters, where artificial roughness elements reduce friction factors while boosting thermal efficiency through enhanced convection. Buongiorno (2005) demonstrated that nanofluids increase heat transfer coefficients beyond thermal conductivity gains alone, with applications in compact heat exchangers for industrial cooling. Xuan and Li (2003) measured convective heat transfer coefficients in nanofluid tubes, revealing volume fraction effects that support designs in energy systems, such as those achieving up to 6700 citations for nanofluid models.
Reading Guide
Where to Start
"Convective Transport in Nanofluids" by Jacopo Buongiorno (2005) introduces core mechanisms with clear explanations of nanofluid enhancements, serving as an accessible entry before turbulence details.
Key Papers Explained
Buongiorno (2005) establishes nanofluid convection models, which Xuan and Li (2003) experimentally validate through tube flow measurements of heat transfer coefficients. Gnielinski (1976) supplies turbulent flow correlations applied in these contexts, while Launder et al. (1975) provide Reynolds-stress modeling foundational to CFD simulations in Kim et al. (1987).
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current work emphasizes CFD-optimized roughness in solar air heaters for exergy gains, though no recent preprints detail emerging configurations. Extensions build on nanofluid and turbulence models toward hybrid solar systems.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | A treatise on electricity and magnetism | 1954 | Journal of the Frankli... | 9.1K | ✕ |
| 2 | Convective Transport in Nanofluids | 2005 | Journal of Heat Transfer | 6.7K | ✕ |
| 3 | On the identification of a vortex | 1995 | Journal of Fluid Mecha... | 6.2K | ✕ |
| 4 | Fundamentals of Heat and Mass Transfer | 2011 | — | 5.5K | ✕ |
| 5 | Turbulence statistics in fully developed channel flow at low R... | 1987 | Journal of Fluid Mecha... | 4.7K | ✕ |
| 6 | Investigation on Convective Heat Transfer and Flow Features of... | 2003 | Journal of Heat Transfer | 4.6K | ✕ |
| 7 | Introduction to Heat Transfer | 2011 | — | 4.2K | ✕ |
| 8 | New equations for heat and mass transfer in turbulent pipe and... | 1976 | Medical Entomology and... | 4.1K | ✕ |
| 9 | Progress in the development of a Reynolds-stress turbulence cl... | 1975 | Journal of Fluid Mecha... | 3.9K | ✕ |
| 10 | Flow past a stretching plate | 1970 | Zeitschrift für angewa... | 3.9K | ✕ |
Frequently Asked Questions
What are the primary heat transfer mechanisms studied in solar air heaters?
Convection dominates in solar air heaters, enhanced by artificial roughness elements that increase turbulence and heat transfer coefficients. Experimental investigations develop correlations for Nusselt numbers and friction factors. CFD analysis validates these enhancements alongside energy and exergy efficiencies.
How do nanofluids improve convective heat transfer?
Nanofluids, colloids of base fluids and 1-100 nm nanoparticles, exhibit higher thermal conductivity and single-phase heat transfer coefficients. Buongiorno (2005) showed increases beyond mere conductivity effects due to particle migration and Brownian motion. Xuan and Li (2003) confirmed higher convective coefficients in turbulent tube flow with rising nanoparticle volume fraction.
What role does CFD play in heat transfer analysis?
CFD simulates flow and temperature fields in solar air heater ducts with artificial roughness. It predicts heat transfer and friction factor correlations matching experimental data. Analyses extend to energy and exergy performance under various operating conditions.
What are key correlations for turbulent heat transfer?
Gnielinski (1976) provided new equations for heat and mass transfer in turbulent pipe and channel flows, widely applied in engineering designs. These account for Reynolds and Prandtl numbers to predict Nusselt numbers accurately. They support performance evaluations in roughened solar air heater channels.
How is turbulence modeled in heat transfer studies?
Reynolds-stress closures model turbulence by solving transport equations for stresses and dissipation rate. Launder et al. (1975) advanced pressure-strain correlation approximations for accurate predictions. Direct numerical simulations, like Kim et al. (1987) at Re=3300, provide statistics for channel flow validation.
Open Research Questions
- ? How do nanoparticle interactions in nanofluids quantitatively contribute to anomalous convective heat transfer enhancements beyond conductivity models?
- ? What optimal artificial roughness geometries minimize friction factor penalties while maximizing Nusselt numbers in solar air heater ducts?
- ? How can exergy analysis refine energy efficiency predictions in roughened channel flows under varying solar irradiance?
- ? Which pressure-strain correlation terms best capture turbulence anisotropy in heat transfer boundary layers?
Recent Trends
The field maintains 39,140 works centered on solar air heater enhancements via roughness and nanofluids, with no growth rate specified over 5 years.
Buongiorno (2005, 6700 citations) and Xuan and Li (2003, 4610 citations) continue dominating citations for nanofluid mechanisms, while turbulence models from Kim et al. and Launder et al. (1975) underpin ongoing CFD applications.
1987No recent preprints or news indicate shifts.
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