Offset Nozzle Design for Homogeneous Gas Flow
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Solution Overview
Problem
Existing nozzle devices for surface conditioning of flat steel products suffer from non-homogeneous gas flow profiles, leading to uneven treatment and potential strength fluctuations in the final product, due to one-sided gas feeding and temperature differences affecting flow speeds.
Innovation Solution
A nozzle device design featuring an outer and inner tube with offset primary and secondary openings, a gas conduction system, and a slit-shaped secondary opening, ensuring a spatially homogeneous gas flow and even residence time, which aligns the flow direction to achieve a uniform velocity profile across the steel product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gas is fed one-sidedly into the nozzle device, then the gas supply is simplified, but an undesirable gradient in the flow profile along the outlet opening results
Solution Approach 1:
The nozzle device is segmented into an inner tube with a primary opening and an outer tube with a secondary opening. The gas feed is divided into two paths: one through the inner tube and another through the outer tube. This segmentation allows the gas flow to be distributed more uniformly across the outlet opening, eliminating the gradient caused by one-sided feeding while maintaining structural simplicity.
Solution Approach 2:
The inner tube is nested within the outer tube, creating a concentric nozzle structure. The primary opening of the inner tube and the secondary opening of the outer tube are offset from each other along the circumferential direction. This nested arrangement enables dual gas feed paths that combine to produce a homogeneous flow profile at the outlet, resolving the contradiction between simple structure and flow uniformity.
2Manufacturing precision
If differently dimensioned opening sizes are used to counteract pressure drop, then flow homogeneity is improved, but device complexity increases
Solution Approach 1:
The nozzle device implements local quality by creating different flow conditions in different regions. The inner tube provides gas flow through its primary opening, while the outer tube provides additional gas flow through its secondary opening positioned at an offset location. This localized differentiation in gas feed positions and paths creates a more uniform overall flow profile without requiring complex variable-sized openings throughout the structure.
3Speed
If gas temperature differences are present, then different flow speeds result along the outlet opening, but temperature control becomes more difficult
Solution Approach 1:
The gas supply is segmented into two separate paths through the inner and outer tubes. This allows different temperature and flow rate conditions to be applied to each path independently. By carefully selecting the dimensions and positions of the primary and secondary openings, the gas flows from both paths can be balanced to achieve uniform flow speeds across the outlet opening, compensating for temperature differences without requiring complex temperature control mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design results in a more effective and uniform surface conditioning of flat steel products, enhancing strength without compromising ductility, allowing for thinner products with consistent quality and material savings.
Implementation Method 1
the outer tube has a secondary opening for the gas to exit from the nozzle device in the direction of the flat steel product, the primary opening and the secondary opening being offset from one another along a circumferential direction, the secondary opening having a gas conduction system for aligning a flow direction of the gas
Implementation Method 2
use is made here of the fact that the residence time in the nozzle device is evenly distributed over the gas or the gas mixture as a result of the selected geometry
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a nozzle device for treating a flat steel product. Said nozzle device comprises an outer tube and an inner tube arranged inside said outer tube, the inner tube having a primary opening for feeding a gas flowing through the nozzle device to an outer tube, and the outer tube having a secondary opening for the gas to exit from the nozzle device in the direction of the flat steel product, the primary opening and the secondary opening being arranged offset to one another along a circumferential direction.