![]() With the larger impeller speed, you can calculate the power cost of the larger fermentor. In this equation, you need to solve for the larger impeller speed. Since you're scaling the fermentor up proportionally to the lab fermentor, you can determine the size of the larger impeller from the volume you have chosen. (Smaller Mixing Speed)^4*(Large Impeller Diameter) = (Larger Mixing Speed)^4*(Smaller Impeller Diameter) The relationship between smaller and larger scale processes for this constraint is: Keeping equal mixing times is important for some processes. Keeping the Power to Liquid Volume Ratio equal.As a consequence, any axial force readings being taken are corrupted and these instruments are forced to rely on torque measurements because of the inadequacies of blade design.There are several ways to determine how to scale up a fermentation process. It effectively compresses a column of powder beneath the blade during its travel path through the sample. The non-helical blade used on other instruments is bent from a flat sheet and presents a large flat central area to the powder being tested. ![]() Repeatably manufactured by Selective Laser Sintering and polished to a specific surface smoothness, it allows Stable Micro Systems to achieve very reproducible, and highly discriminating results.Ĭommenting on the blade, Jim Walker, Founder and Director at Stable Micro Systems, says: "The design of the blade is the single most important factor in achieving repeatable powder flow measurements. The helical blade naturally cuts through the column of powder being tested and negates the need for complex torque measuring systems. The force resulting from the displacement is accurately measured and used to characterise and rank the sample.įrom an engineering perspective: The precision blade is a true helix and can be mathematically described, unlike the blades fitted to other powder measuring devices on the market. The Powder Flow Analyser Controlled Flow Measurement technology offers you the ability to physically displace the powder in a controlled manner that can be optimised to measure the differences between samples, or can be adjusted to be complementary to your process conditions. This may be desirable when required to move downwards through the column with minimum disturbance and therefore effect on the sample in order to measure a characteristic on the upward cycle of the test or when looking to 'cut' through a column in order to measure the strength of a cake that has been formed after compaction/consolidation to a specified stress in order to imitate storage conditions. Slicing/Shearing through a powder column allows movement through the sample with minimum disturbance when required by moving at the same helical path angle as the blade profile. It can also effectively measure particle cohesion and flow behaviour after compaction has been employed.Ĭompaction/Compressing – this method allows the measure of flow properties with changing compaction force and flow speed and provides an investigation of caking potential. Lifting/Aerating – this action allows the powder column to be conditioned, thereby giving independence from sample loading variations. Users can, however, fully program the instrument to carry out slicing, shearing, compressing, compacting and aerating cycles in any combination.ĭepending upon the programmed rotation of the blade in terms of path angle, blade direction and tip speed the powder column can be displaced in a number of different ways to suit the process and properties to be measured. The Powder Flow Analyser is supplied with library tests, so operators can start testing quickly and conveniently after straightforward installation and calibration. World leaders in texture analysis and volume measurement FIND OUT WHY
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