DETERMINATION OF PRESSURE DROP IN A TWO-PHASE, LIQUID-LIQUID SYSTEM IN A HORIZONTAL PIPELINE THROUGH MATLAB SIMULATION

• Main Author: Khalid, Nor Hidayah
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi PETRONAS 2011
• Subjects: TP Chemical technology
• Online Access: http://utpedia.utp.edu.my/10382/1/2011%20-%20Determination%20of%20Pressure%20Drop%20in%20a%20Two-Phase%2C%20Liquid-Liquid%20System%20in%20a%20Horizontal%20Pipeli.pdf; http://utpedia.utp.edu.my/10382/

The pressure drop of the flow inside the pipeline is an important parameter to be determined before proceeding with the design. This parameter is very important to pipeline size selection and the design of the downstream facilities. Underestimation of pressure drop will give a smaller pipe size than required, thus the transportation capacity will be restricted. In the other hand, overestimation of pressure drop will cause in oversized pipeline, worse sweeping characteristics, and possible solid dropout and corrosion issues. The wrong prediction of pressure drop is likely to occur in a liquid-liquid two phase system which false predictions of interface configurations are made. A tlat intertace is assumed between the phases which actually highly applicable for high-density differential system, such as gas-liquid system under earth condition. However, tor liquid-liquid system with small density differences or in reduced gravity system, the factor of curvature interface must be considered. The interface configuration tor liquid-liquid systems can either be tlat, concave or convex. Hence, to overcome this problem, a model is developed to calculate pressure drop tor liquid-liquid system that will consider the tactor of curvature interface between the phases. In this modelling, two-fluid model is used for prediction of pressure drop and this model is derived to make it applicable tor stratified tlow system only. The model is developed by using MATLAB programming and it is tested with tew sets of input data. The calculated pressure drop from this model is compared with experimental data to check for its reliability. As a conclusion, it is shown that tlat-shape intertace assumption is not the best assumption for this prediction. The percentage difference of prediction is very large when it was compared to experimental data. Curvature intertacial contiguration is assumed to give best prediction, however, in this project, the curvature interfuce assumption not give an expected result. This is due to some ambiguity in cross sectional area and wetted perimeter derivation formula used in this model. Hence, modification in the correlated function has to be developed to prove that calculation using the curved interface will give better assumption of pressure drop.