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(Reynolds transport theorem) A sanding operation injects 1.1 × 105 particles/s into the air in a room as shown in the figure below. The amount of dust in the room is maintained at a constant level by a ventilating fan that draws clean air into the room at section (1) and expels dusty air at section (2). Consider a control volume whose surface is the interior surface of the room (excluding the sander) and a system consisting of the material within the control volume at time t = 0. a) If N is the number of particles, discuss the physical meaning of and evaluate the terms Choose the correct evalations. DN sys Dt aNev dt Inlet i b) Use the Reynolds transport theorem to determine the concentration of particles (particles/m³) in the exhaust air for steady-state conditions. Sander = 2.4 m/s Outlet particles/m³ = 0.11 m² DN sys Dt Control surface and ƏNev dt