A 200 µm spherical particle has been fixed to a spatula using super-glue and has been very slowly brought downward to a 5 nm (nanometre) separation distance with another spherical particle with the diameter of 100 µm which is free standing on a surface (Figure 2). If it the spatula is very slowly moved upward, determine if the 100 um particle can be lifted in this way. The density of both particles is 1200 kg/m³. The experiment is carried out in air. The Hamaker constant for both particles in air is 50 x 10-20J.

A 200 µm spherical particle has been fixed to a spatula using super-glue and has been very slowly brought downward to a 5 nm (nanometre) separation distance with another spherical particle with the diameter of 100 µm which is free standing on a surface (Figure 2). If it the spatula is very slowly moved upward, determine if the 100 um particle can be lifted in this way. The density of both particles is 1200 kg/m³. The experiment is carried out in air. The Hamaker constant for both particles in air is 50 x 10-20J.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.26P

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