The reactor described in Example 12.15 is fitted with a flat blade disc turbine agitator 0.6 m diameter, running at 120rpm.The vessel is baffled and is constructed of stainless-steel plate 10 mm thick.The physical properties of the reactor contents are: ρ = 850kg/m³, μ = 80 mNm^–2s, k_f = 400 × 10^–3W/m°C,C_p = 2.65 kJ/kg°C. Estimate the heat-transfer coefficient at the vessel wall and the overall coefficient in the clean condition.

Data from Example 12.15

A jacketed, agitated reactor consists of a vertical cylinder 1.5 m diameter, with a hemispherical base and a flat, flanged, top. The jacket is fitted to the cylindrical section only and extends to a height of 1 m. The spacing between the jacket and vessel walls is 75 mm. The jacket is fitted with a spiral baffle. The pitch between the spirals is 200 mm. The jacket is used to cool the reactor contents. The coolant used is chilled water at 10°C; flow-rate 32,500 kg/h, exit temperature 20°C. Estimate the heat-transfer coefficient at the outside wall of the reactor and the pressure drop through the jacket.