Increased surface area offers more surface area for heat transmission between particles and fluids. Particles moving in a Brownian motion have a high degree of dispersion stability. To achieve equivalent heat transfer intensification, the pumping power is reduced in comparison to pure liquid. When compared to traditional slurries, particle clogging is reduced, allowing for system miniaturization. Variable properties, such as heat conductivity and surface wet ability, can be produced by changing particle concentrations to suit different purposes.
Nanofluids are fluids that consist of a base fluid with nano-sized particles (1–100 nm) suspended within them. These particles, generally a metal or metal oxide, increase conduction and convection coefficients, allowing for more heat transfer. In the past few decades, rapid advances in nanotechnology have led to emerging of a new generation of coolants called nanofluids
Higher specific surface area and therefore more heat transfer surface between particles and fluids. • Higher dispersion stability with predominant Brownian motion of particles. • Reduced pumping power as compared to pure liquid to gain equivalent heat transfer intensification. • Reduced particle clogging as compared to regular slurries, thus promoting system miniaturization. • Adjustable properties, including thermal conductivity and surface wettability, by varying particle concentrations to suit different applications.
You mean that the above advantages are achieved by Nano fluids??@Talha
"Particles moving in a Brownian motion have a high degree of dispersion stability."
That's simply not true.
Actually it is a random motion of particles and collide rapidly with each other and dispersion stability is very high
Muhammad Talha No. Random diffusion is what causes aggregation. It is the presence of a repulsive pair potential energy (e.g., electrostatic or steric) that prevents particles from getting so close that the thermal energy associated with diffusion is insufficient to overcome the attraction. Simple colloid science.
Sufficiently fast random diffusion and low density difference between particles and liquid is what prevents sedimentation/creaming.
Very high performance in heat transfer is one of the nano-fluid advantages .
Enhancement of heat transfer coefficient leads to minimization the size of heat transfer equipment.
Reduction in pressure drop occur due to smaller size of nanoparticles.
- Badges
- Science topic