Consider an electric kitchen mixer. This electric mixer can mix 1.1 liters of water by rotating its blades. Assume that the thickness of its blade is 6 mm, which is 171 watts of energy supplied by the mixer to the tank. If the inside of the stirrer tank is made of pure water, The speed of the stirrer angles is 242 rpm and its radius is 12cm, then answer the following. A) Find the longitudinal, temporal, and velocity scales for the smallest vortices in the field. B) Identify the scale, longitudinal, temporal, and velocities of the largest vortex structures in the field. C) What is your estimate for turbulence viscosity? (Turbulence viscosity is described on pages 12 and 11 of the reference book

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false