Shear Stress vs Shear Rate
0 likes283 views
This document discusses different types of fluids and their rheological properties. Newtonian fluids have a linear relationship between shear stress and shear rate, whereas non-Newtonian fluids have a non-linear relationship that can be modeled using an apparent viscosity that depends on shear rate. Common examples of non-Newtonian fluids are Bingham plastics, which have a yield stress, as well as dilatant and pseudoplastic fluids, where the apparent viscosity increases or decreases with increasing shear rate, respectively.
Related topics:1 of 1
Download to read offline
![wet bulb temperature presentation[HVAC]](https://cdn.slidesharecdn.com/ss_thumbnails/7-210228044304-thumbnail.jpg?width=560&fit=bounds)
Shear Stress vs Shear Rate
- 1. Thixotropic – (Printer’s Ink) Velocity Gradient (Deformation Rate) Velocity Gradient (Deformation Rate) Rheopectic Bingham/Ideal Plastic – (Toothpaste, Drilling Mud) Elastic Solid 𝜏 = 𝜇 𝑑𝑢 𝑑𝑦 + 𝐵 Ideal Fluid (𝒖 = 0 or 𝝉 = 0) 𝒅𝒖 𝒅𝒚 𝝉(𝒌𝑵/𝒎𝟐) Newtonian – (Water, Air, Gasoline) Yield Stress (𝝉𝟎) Dilatant – (Solution with suspended sand, Starch) Shear Thickening Pseudo Plastic – (Blood, Paint, Paper Pulp) Shear Thinning 𝜏 = 𝜇 𝑑𝑢 𝑑𝑦 Newtonian Fluid : – Non-Newtonian Fluid : – 𝜏 = 𝜇𝑎𝑝𝑝 𝑑𝑢 𝑑𝑦 + 𝐵 𝜇𝑎𝑝𝑝 = 𝜇 𝑑𝑢 𝑑𝑦 − , 1) n = 1, B = 𝝉𝟎 Bingham Plastic Fluid 2) n > 1, B = 0 Dilatant Fluid 3) n < 1, B = 0 Pseudoplastic Fluid 1) 𝛕 ↑ → 𝛍𝐚𝐩𝐩 ↑ → Rheopectic Fluid 2) 𝛕 ↑ → 𝛍𝐚𝐩𝐩 ↑ → Thixotropic Fluid 𝛍𝐚𝐩𝐩 𝐭