Open AccessAnalytical and Numerical Simulations to Observe the Seawater Cooling Phenomena Through a Single Rectangular Plate-Fin
Author(s) -
Arief Goeritno
Publication year - 2022
Publication title -
mathematical modelling and engineering problems/mathematical modelling of engineering problems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.26
H-Index - 11
eISSN - 2369-0747
pISSN - 2369-0739
DOI - 10.18280/mmep.090120
Subject(s) - energy balance , runge–kutta methods , euler equations , ordinary differential equation , mechanics , ode , numerical analysis , computer simulation , thermodynamics , euler's formula , energy (signal processing) , mathematics , constant (computer programming) , differential equation , backward euler method , mathematical analysis , physics , computer science , statistics , programming language
This paper describes several simulations of the seawater cooling phenomenon using a theoretical approach based on analytical method, numerical method of Euler’s and Runge-Kutta of fourth-order (RK4). These research objectives, i.e. to get the energy balance equations, to use the solution equations, and to do the simulation processes. The methods used, i.e. (i) do the completion of mathematical equations to get the constants for energy balance based on the ordinary differential equations (ODEs), (ii) do the made of solving equations for simulation, and (iii) does the simulation processes assisted by a spreadsheet application and result in analysis. The results are in the form of (a) the constants for energy balance, i.e. b1 is 0.9134∙10-3 sec-1 and b2 is 0.31∙10-6 sec-1, (b) produced three solving equations for the simulation, and (c) obtained curves of the temperature changes. The results of the simulation processes based on a spreadsheet application have obtained the results, that the time span 1800 seconds (30 minutes) can cause changes in the temperature of the fluid from 25℃ to (i) 4.823770℃ with a rate of change of 0.092%, if used of the analytical method; (ii) 4.819088℃ with a rate of change of 0.092%, if used the numerical method of Euler’s; and (iii) 5.600404℃ with a rate of change of 0.083%, if used the numerical method of RK4’s. The conclusion in this paper, that all the curves of changes in the temperature of the fluid are the non-linear curves. Even though the final value of temperature is the highest, but the RK4 more thoroughly. Suggestions for future work, that the simulation of its phenomena must be begun with making the mathematical models with the analytical and/or numerical method and implemented them into the computer application.