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(a) Summarize the philosophy used in the design of conical hoppers to ensure flow from the outlet when the outlet valve is opened. (b) Explain how the powder flow function and the effective angle of internal friction are extracted from the results of shear cell tests on a powder. (c) A firm having serious hopper problems takes on a chemical engineering graduate. The hopper in question feeds a conveyor belt and periodically blocks at the outlet and needs to be 'encouraged' to restart. The graduate makes an investigation on the hopper, commissions shear cell tests on the powder and recommends a minor modification to the hopper. After the modification the hopper gives no further trouble and the graduate's reputation is established. Given the information below, what was the graduate's recommendation?

(a) Summarize the philosophy used in the design of conical hoppers to ensure flow from the outlet when the outlet valve is opened. (b) Explain how the powder flow function and the effective angle of internal friction are extracted from the results of shear cell tests on a powder. (c) A firm having serious hopper problems takes on a chemical engineering graduate. The hopper in question feeds a conveyor belt and periodically blocks at the outlet and needs to be 'encouraged' to restart. The graduate makes an investigation on the hopper, commissions shear cell tests on the powder and recommends a minor modification to the hopper. After the modification the hopper gives no further trouble and the graduate's reputation is established. Given the information below, what was the graduate's recommendation?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Question 4: (a) Summarize the philosophy used in the design of conical hoppers to ensure flow from the outlet when the outlet valve is opened. (b) Explain how the powder flow function and the effective angle of internal friction are extracted from the results of shear cell tests on a powder. (c) A firm having serious hopper problems takes on a chemical engineering graduate. The hopper in question feeds a conveyor belt and periodically blocks at the outlet and needs to be 'encouraged' to restart. The graduate makes an investigation on the hopper, commissions shear cell tests on the powder and recommends a minor modification to the hopper. After the modification the hopper gives no further trouble and the graduate's reputation is established. Given the information below, what was the graduate's recommendation? Existing design: Material of wall – mild steel Semi-included angle of conical hopper 33° Outlet – circular, fitted with 25 cm diameter slide valve Shear cell test data: Effective angle of internal friction, 8 = 60 Angle of wall friction on mild steel, Ow = 8 Bulk density, ph =1250 kg/m³ Powder flow function: 0y = 0.0.55(Gy and oc in kN/m²)
Transcribed Image Text:Question 4: (a) Summarize the philosophy used in the design of conical hoppers to ensure flow from the outlet when the outlet valve is opened. (b) Explain how the powder flow function and the effective angle of internal friction are extracted from the results of shear cell tests on a powder. (c) A firm having serious hopper problems takes on a chemical engineering graduate. The hopper in question feeds a conveyor belt and periodically blocks at the outlet and needs to be 'encouraged' to restart. The graduate makes an investigation on the hopper, commissions shear cell tests on the powder and recommends a minor modification to the hopper. After the modification the hopper gives no further trouble and the graduate's reputation is established. Given the information below, what was the graduate's recommendation? Existing design: Material of wall – mild steel Semi-included angle of conical hopper 33° Outlet – circular, fitted with 25 cm diameter slide valve Shear cell test data: Effective angle of internal friction, 8 = 60 Angle of wall friction on mild steel, Ow = 8 Bulk density, ph =1250 kg/m³ Powder flow function: 0y = 0.0.55(Gy and oc in kN/m²)
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