Foamed Cementitious Slurry Channel Layout for Low Foam Loss
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Solution Overview
Problem
The mixing of foam with cementitious slurry in existing methods leads to high foam loss due to shear forces, destabilizing bubbles and resulting in inefficient density reduction of gypsum products.
Innovation Solution
A channel with a specific length between the foam inlet and the second end, ranging from 400 mm to 1200 mm, is used to introduce foam into the cementitious slurry, ensuring even mixing with minimal foam loss and reduced backpressure, along with optimized cross-sectional dimensions and foam inlet positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If foam is mixed with cementitious slurry in a mixing chamber, then the foam can be combined with the slurry, but the high shear rates break up bubbles and destabilise the foam, leading to high foam loss
Solution Approach 1:
The mixing process is segmented into two distinct stages: first, the cementitious slurry is prepared in a mixing chamber; second, the foam is introduced and mixed with the slurry in a separate channel. This segmentation avoids the high shear rates that occur in conventional single-chamber mixing, thereby preventing bubble break-up and foam destabilisation while achieving effective mixing.
2Manufacturing precision
If the channel length is increased to improve foam mixing, then foam homogeneity improves, but backpressure increases
Solution Approach 1:
The channel dimensions are optimised by changing the cross-sectional area parameters. The channel has a rectangular cross-section with width-to-depth ratio between 1:1 and 3:1, which modifies the flow characteristics and pressure distribution along the channel, allowing sufficient mixing length while controlling backpressure.
3Ease of manufacture
If the channel length is reduced for compact installation, then ease of installation improves, but foam mixing homogeneity deteriorates
Solution Approach 1:
Instead of increasing channel length in one dimension, the design optimizes the cross-sectional dimensions (width and depth) to create an efficient mixing environment. The rectangular cross-section with specific width-to-depth ratio provides enhanced mixing effectiveness within a more compact length, achieving homogeneity without excessive channel length.
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
The solution achieves consistent and efficient mixing of foam with cementitious slurry, reducing foam loss and backpressure, resulting in improved homogeneity and density reduction of the final product.
Implementation Method 1
a channel fluidly connected to the mixing chamber at a first end, the channel for receiving the cementitious slurry from the mixing chamber
Implementation Method 2
the foam inlet is configured to introduce foam into the channel in a direction generally parallel to the second dimension
Data Source
AI summary
There is provided an apparatus (100) for manufacturing a cementitious slurry comprising foam, the apparatus (100) comprising: a mixing chamber (101) for mixing a cementitious material and water to form a cementitious slurry, a channel (103) fluidly connected to the mixing chamber (101) at a first end, the channel (103) for receiving the cementitious slurry from the mixing chamber (101), the channel (103) extending from the first end and terminating a second end; the channel (103) comprising a foam inlet (106) for introducing foam into the channel (103); wherein the portion of the channel (103) between the foam inlet (106) and the second end has a length from 400 mm to 1200 mm inclusive, wherein said foam inlet (106) is positioned such that the distance between said first end of said channel (103) and said foam inlet (106) is less than 25% of the distance between said first end of said channel (103) and said second end of said channel (103). A cementitious slurry channel (103) and a method of manufacturing a cementitious slurry are also provided.