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1	Method development : follow liquid distribution in real time / Metodutveckling för vätskespridning Ndahimana, Joice, Issa, Tammar January 2017 (has links) Continuous development and improvement of the modern disposable diaper is crucial for the optimization of product performance. Several methods are used for evaluation and improvements to sustain high quality diapers being produced. The aim of this thesis was to develop a new test method that follows liquid distribution in real time by combining two pre-existing measurement systems. Rewet is the amount of liquid that returns to the surface of diapers when subjected to pressure. Distribution of absorption material is examined by exposing the product core to radiation. These two measurement systems don’t convey anything about the course of the liquid in the diaper when tested separately. This method development is meant to be beneficial for research and development purposes at SCA, working as a complement to the pre-existing methods being used in the laboratory. The following questions are of interest: • Can the rewet test method be performed on a baby diaper while simultaneously exposing the product core to radiation so the course of the liquid can be followed in real time? • Is the liquid distribution (wet area) affected by different product compositions e.g. SAP or thickness? By modifying the current methods, rewet can be performed inside the x-ray equipment while studying the consistency of absorption material and following the liquid behavior in the product core. The developed method was verified by testing on handmade products with different compositions. The developed method’s rewet value has proved to be equivalent to the one tested outside, showing no significant difference between the two. Absorption diaper diffusion liquid distribution method development permeability pulp rewet SAP skin health thickness wet area x-ray. Chemical Engineering Kemiteknik
2	Development of Universal Databases and Predictive Tools for Two-Phase Heat Transfer and Pressure Drop in Cryogenic Flow Boiling Heated Tube Experiments Vishwanath Ganesan (7650614) 03 August 2023 (has links) <p>In this study, universal databases and semi-empirical correlations are developed for cryogenic two-phase heat transfer and pressure drop in heated tubes undergoing flow boiling.</p> Turbulent flows two-phase flow heat transfer pressure drop flow boiling boiling curve nucleate boiling critical heat flux film boiling minimum heat flux rewet temperature cryogens liquid helium liquid hydrogen liquid neon liquid nitrogen liquid argon liquid methane correlation database heat transfer coefficient pressure gradient nonequilibrium

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Method development : follow liquid distribution in real time / Metodutveckling för vätskespridning

Development of Universal Databases and Predictive Tools for Two-Phase Heat Transfer and Pressure Drop in Cryogenic Flow Boiling Heated Tube Experiments