Related Experiment Video
Updated: Feb 27, 2026
07:19
Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars
Published on: August 20, 2014
12.7K
Flow Stability of Nanofluid Thin Films on Non-Uniformly Heated Porous Slopes
Jiawei Li1, Xia Li1, Liqing Yue1
1School of Mathematical Science, Inner Mongolia University, Hohhot 010021, China.
Nanomaterials (Basel, Switzerland)
|February 26, 2026
Summary
Nanoparticles stabilize thin liquid films on porous surfaces, suppressing instabilities. Increased nanoparticle concentration enhances stability, crucial for microfluidic and coating applications.
Area of Science:
- Fluid Dynamics
- Nanotechnology
- Heat Transfer
Background:
- Thin liquid film flows are vital in microfluidics and coating.
- Nanofluids offer enhanced thermal properties for these applications.
- Flow over porous surfaces introduces complex hydrodynamic behaviors.
Purpose of the Study:
- To analyze the hydrodynamic and thermal stability of nanofluid flow on inclined porous surfaces.
- To investigate the influence of various parameters on film stability.
- To understand the role of nanoparticles in stabilizing thin liquid films.
Main Methods:
- Derivation of a nonlinear evolution equation using long-wave approximation.
- Analysis using linear stability theory and weakly nonlinear analysis.
- Numerical simulations via Fast Fourier Transform (FFT).
Main Results:
- Porous medium permeability, density difference, and Marangoni number destabilize the flow.
- Higher nanoparticle concentration (0 to 0.3) significantly stabilizes the film.
- Nanoparticles reduce critical Reynolds number and suppress disturbance amplitude.
Conclusions:
- Nanoparticle addition is a key factor in stabilizing thin nanofluid films on porous surfaces.
- Understanding these stability dynamics is critical for optimizing microfluidic and coating processes.
- The study provides insights into controlling interfacial instabilities through nanofluid formulation.
Related Concept Videos
01:17Steady, Laminar Flow Between Parallel Plates
925
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
925
01:18Newtonian Fluid: Problem Solving
1.1K
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
1.1K
01:27Energy Considerations in Open Channel Flow
663
Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
663
01:22Couette Flow
1.2K
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...
1.2K
01:05Fluid Pressure over Flat Plate of Constant Width
2.5K
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
The resultant force...
2.5K
01:12Fluid Pressure over Curved Plate of Constant Width
2.0K
When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
2.0K