scholarly journals THE RESEARCH OF THE BASIC CHANNEL CONTROL PROCESS OF PETROLEUM DISTILLATION AND DEVELOPMENT OF DYNAMIC MODELS / PAGRINDINIŲ NAFTOS DISTILIAVIMO SISTEMOS KANALŲ VALDYMO PROCESŲ TYRIMAS IR DINAMINIŲ MODELIŲ SUDARYMAS

2013 ◽  
Vol 5 (2) ◽  
pp. 115-118
Author(s):  
Vitaliy Likhavitski
Keyword(s):  
Heat Transfer ◽  
Boiling Point ◽  
Dynamic Models ◽  
Control Process ◽  
Temperature Fluctuations ◽  
Feed Stock ◽  
Flow Heat ◽  
Channel Control ◽  
Object Of Control

As the object of control, the process of oil distillation in the atmospheric column is complex and multidimensional with interconnected controlled variables. These controlled variables are the outgoing indexes of the column – the quality of receivable hydrocarbon fractions, for assessment of which the boiling point for each product is used. The basic perturbation actions to the process are connected with the adjustment of quantity and the composition of feed stock supplied to the column and flow heat transfer change due to temperature fluctuation of feed stock, temperature fluctuations of external reflux and other factors. Santrauka Atmosferinės naftos distiliavimo talpyklos sistemos valdymas yra sudėtingas ir daugiamatis procesas. Jį sudaro tarpusavio ryšiais susieti kintamieji. Tai yra distiliavimo talpyklos parametrai – gautųjų angliavandenilio frakcijų kokybė, pagal kurią nustatoma kiekvieno produkto virimo temperatūra. Šio proceso sudėtingumas siejasi su skysčio, tiekiamo į talpyklą, srauto ir sudėties reguliavimu, srauto temperatūros perdavimo pokyčiais dėl tiekiamo skysčio temperatūros bei atgalinio srauto temperatūros svyravimo ir kitų veiksnių. Straipsnis anglų kalba.

Methods of parallel computing for multilevel fuzzy Takagi – Sugeno systems

2016 ◽  
pp. 141-149
Author(s):  
S.V. Yershov ◽  
◽  
R.М. Ponomarenko ◽  
Keyword(s):  
Dynamic Models ◽  
Fuzzy Inference ◽  
Knowledge Bases ◽  
Comparative Characteristic ◽  
Software Systems ◽  
Scientific Papers ◽  
Speed Up ◽  
Diagnostic Software ◽  
Takagi Sugeno

Parallel tiered and dynamic models of the fuzzy inference in expert-diagnostic software systems are considered, which knowledge bases are based on fuzzy rules. Tiered parallel and dynamic fuzzy inference procedures are developed that allow speed up of computations in the software system for evaluating the quality of scientific papers. Evaluations of the effectiveness of parallel tiered and dynamic schemes of computations are constructed with complex dependency graph between blocks of fuzzy Takagi – Sugeno rules. Comparative characteristic of the efficacy of parallel-stacked and dynamic models is carried out.

Simulation of Electrohydrodynamic Enhancement of Laminar Flow Heat Transfer

1993 ◽  
Vol 1 (1) ◽  
pp. 115-126 ◽  
Author(s):  
George S. Dulikravich ◽  
Vineet Ahuja ◽  
Seungsoo Lee
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Flow Heat ◽  
Electrohydrodynamic Enhancement

Development of a Transient Model for Fluid Flow, Heat Transfer and Pressure Buildup in Wellbores

2020 ◽  
Author(s):  
Ianto Martins ◽  
Arthur Pandolfo da Veiga ◽  
Eduardo Alves ◽  
Jader Barbosa
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Transient Model ◽  
Pressure Buildup ◽  
Flow Heat

Experimental Investigation of Heat Transfer Enhancement by Using Different Number of Fins in Circular Tube

2018 ◽  
Vol 6 (3) ◽  
pp. 1-12
Author(s):  
Kamil Abdul Hussien
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cold Water ◽  
Finned Tube ◽  
Hot Water ◽  
Copper Tube ◽  
Smooth Tube ◽  
Tube Heat Exchanger ◽  
Mass Flow Rates ◽  
Flow Heat

Abstract-The present work investigates the enhancement of heat transfer by using different number of circular fins (8, 10, 12, 16, and 20) in double tube counter flow heat exchanger experimentally. The fins are made of copper with dimensions 66 mm OD, 22 mm ID and 1 mm thickness. Each fin has three of 14 mm diameter perforations located at 120o from each to another. The fins are fixed on a straight smooth copper tube of 1 m length, 19.9 mm ID and 22.2 mm OD. The tube is inserted inside the insulated PVC tube of 100 mm ID. The cold water is pumped around the finned copper tube, inside the PVC, at mass flow rates range (0.01019 - 0.0219) kg/s. The Reynold's number of hot water ranges (640 - 1921). The experiment results are obtained using six double tube heat exchanger (1 smooth tube and the other 5 are finned one). The results, illustrated that the heat transfer coefficient proportionally with the number of fin. The results also showed that the enhancement ratio of heat transfer for finned tube is higher than for smooth tube with (9.2, 10.2, 11.1, 12.1 13.1) times for number of fins (8, 10, 12, 16 and 20) respectively.

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