Bell mouth

Bell mouth

A bell mouth is a smoothly curved entrance to a duct that produces a uniform face velocity and reduces turbulence compared to plain or tapered duct entrances. The suction from the bell mouth can result in high turbulent kinetic energy at the vortex center.From: Industrial Hygiene Control of Airborne Chemical Hazards [2019], LES study of transient behaviour and turbulent characteristics of free-surface and floor-attached vortices in pump sump [2019]

Forced Airflow

View Chapter

Purchase Book

Published in James Jones, Demetri Telionis, Aeroform, 2023

James Jones, Demetri Telionis

The inlet conditions and entry type also affect the resistance to airflow. An open-ended (plain) or flanged entry tends to create turbulence downstream of the entry. This disturbs the stream, resulting in loss of energy. As previously mentioned, a bell mouth entry, on the other hand, creates a smooth airflow pattern with less turbulence (Figure 7.27). Once again, if energy consumption is a consideration, then the entry condition should be considered.

Critical submergence for side circular intake in an open channel flow

View Article

Journal Information

Published in Journal of Hydraulic Research, 2021

Muhammed Hashid, Ajmal Hussain, Zulfequar Ahmad

Since the present study used both intakes with and without bellmouth, the discharge coefficient of intake is analysed for a better correlation of experimental data. Intake with bellmouth transition helps in the reduction of entry loss of head when compared to the normal one preventing the flow separations. The bellmouth transitions help in the reduction of critical submergence compared to those without transition when both are carrying the same discharge.

Explore chapters and articles related to this topic

Forced Airflow

Critical submergence for side circular intake in an open channel flow