Related Experiment Video
Updated: May 18, 2026
10:12
Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
Published on: June 12, 2015
Analytical modeling for heat transfer in sheared flows of nanofluids
Claudio Ferrari1, Badr Kaoui, Victor S L'vov
1ISIS R&D Srl, Viale G. Marconi 893, Roma I-00146, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
Summary
This study introduces a new model for heat flux enhancement in nanofluids using rotating nanoparticles. The model predicts significant heat flux increases beyond traditional limits, especially with spherical nanoparticles.
Area of Science:
- Fluid Dynamics
- Heat Transfer
- Nanotechnology
Background:
- Existing thermal models for nanofluids often overlook nanoparticle dynamics.
- The contribution of nanoparticle rotation to heat flux has not been fully incorporated.
Purpose of the Study:
- To develop a comprehensive model for heat flux enhancement in sheared laminar flows of nanofluids.
- To account for the effects of nanoparticle rotation on heat transfer.
Main Methods:
- Development of a theoretical model incorporating nanoparticle heat flux and rotation.
- Extensive numerical simulations to validate the model's predictions.
Main Results:
- The model demonstrates that nanoparticle rotation significantly impacts heat flux.
- A potential for heat flux enhancement far exceeding the Maxwell-Garnett limit was observed for spherical nanoparticles.
Conclusions:
- Nanoparticle rotation is a critical factor in enhancing heat flux in nanofluids.
- The developed model offers a pathway toward accurate predictions of heat flux enhancement in flowing nanofluids.
Related Concept Videos
01:20Mechanisms of Heat Transfer II
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
01:14Mechanisms of Heat Transfer I
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
01:14Mechanisms of Heat Transfer
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
01:22Couette Flow
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
01:30Typical Model Studies
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
01:19Mechanism of heat transfer
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...