scholarly journals A System Modelling Approach Optimization Process and Machine Utilization In Casting Plant Using Lean Manufacturing Simulation Model

2021 ◽  
Vol 2 (2) ◽  
pp. 116-121
Author(s):  
M Ali Pahmi
Keyword(s):  
Heat Transfer ◽  
Simulation Model ◽  
Lean Manufacturing ◽  
Optimization Process ◽  
System Modelling ◽  
Casting Plant ◽  
Conveyor System ◽  
Manufacturing Simulation ◽  
Machine Utilization ◽  
Modelling Approach

Perbaikan berkelanjutan, reduksi dan eliminasi waste dalam proses bisnis menjadi salah satu aspek yang dilakukan agar dapat terus memiliki daya saing yang sustainable. PT. X saat ini sedang dalam proses melakukan transformasi, reduksi dan eliminasi NVA serta perbaikan berkelanjutan di sisi proses guna meningkatkan daya saing yang sustainable. penelitian ini bertujuan dalam menganalisis dan mengajukan formulasi perbaikan proses menggunakan metode kerangka kerja pemodelan sistem dan simulasi. Temuan dari penelitian diketahui bahwa peningkatan Utilisasi Dies rata-rata 82,82 % relative meningkat 36% dibanding simulasi sebelumnya (52,9%); dengan rata-rata output 21,04 pcs/jam relative meningkat 42% dibanding simulasi sebelumnya (12,9 pcs/jam), hal ini dengan melakukan improvement proses semi auto dalam proses eject produk yang sekaligus berdampak dalam pengurangan manpower, serta mereduksi loss time akibat lama proses pendinginan dengan sistem heat transfer conveyor system

scholarly journals Numerical Analysis of Mixed Convective Heat Transfer from a Square Cylinder Utilizing Nanofluids with Multi-Phase Modelling Approach

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5485
Author(s):  
Rajendra S. Rajpoot ◽  
Shanmugam. Dhinakaran ◽  
Md. Mahbub Alam
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Convective Heat Transfer ◽  
Richardson Number ◽  
Base Fluid ◽  
Square Cylinder ◽  
Heat Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Multi Phase ◽  
Modelling Approach

The present study deals with the numerical simulation of mixed convective heat transfer from an unconfined heated square cylinder using nanofluids (Al2O3-water) for Reynolds number (Re) 10–150, Richardson number (Ri) 0–1, and nanoparticles volume fractions (φ) 0–5%. Two-phase modelling approach (i.e., Eulerian-mixture model) is adopted to analyze the flow and heat transfer characteristics of nanofluids. A square cylinder with a constant temperature higher than that of the ambient is exposed to a uniform flow. The governing equations are discretized and solved by using a finite volume method employing the SIMPLE algorithm for pressure–velocity coupling. The thermo-physical properties of nanofluids are calculated from the theoretical models using a single-phase approach. The flow and heat transfer characteristics of nanofluids are studied for considered parameters and compared with those of the base fluid. The temperature field and flow structure around the square cylinder are visualized and compared for single and multi-phase approaches. The thermal performance under thermal buoyancy conditions for both steady and unsteady flow regimes is presented. Minor variations in flow and thermal characteristics are observed between the two approaches for the range of nanoparticle volume fractions considered. Variation in φ affects CD when Reynolds number is varied from 10 to 50. Beyond Reynolds number 50, no significant change in CD is observed with change in φ. The local and mean Nusselt numbers increase with Reynolds number, Richardson number, and nanoparticle volume fraction. For instance, the mean Nusselt number of nanofluids at Re = 100, φ = 5%, and Ri = 1 is approximately 12.4% higher than that of the base fluid. Overall, the thermal enhancement ratio increases with φ and decreases with Re regardless of Ri variation.

Simulation of Cooling Process of Medium Thickness Steel Plate

2008 ◽  
Vol 594 ◽  
pp. 34-38
Author(s):  
Ji Guang Han ◽  
Yang Bai
Keyword(s):  
Heat Transfer ◽  
Simulation Model ◽  
Steel Plate ◽  
Accelerated Cooling ◽  
Mathematics Model ◽  
Cooling Process ◽  
Medium Thickness

By carefully researching and analyzing on cooling process of medium thickness steel plate, a mathematics model of heat transfer and its corresponding simulation model are established and evaluated with finite discrimination for a selected cooling object, and a simulation model is established. Through simulation and locate testing, the calculated values obtained are agreed very well with the measured ones. This indicates that the simulation model can preferably reveal the accelerated cooling process of medium thickness steel plate and can be applied to guide the manufacture of medium thickness steel plate.

Numerical Simulation Model of Electrothermal De-Icing Process on Composite Substrate

2020 ◽  
Author(s):  
Xiaofeng Guo ◽  
Zhiqiang Guo ◽  
Qian Yang ◽  
Wei Dong
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Thermal Properties ◽  
Temperature Distribution ◽  
Simulation Model ◽  
Melting Process ◽  
Ice Melting ◽  
Melted Zone ◽  
Composite Substrate ◽  
Cfrp Composite

Abstract A numerical simulation model of electrothermal de-icing process on carbon fiber reinforced polymer (CFRP) composite is conducted to study the effect of thermal properties of the substrate on the ice melting process. A novel melting model which is based on the enthalpy-porosity method is applied to study the transient ice melting process and heat transfer of the de-icing sys-tem. Multi-layered electrothermal de-icing systems including composites with different fiber orientation are used to analyze the effects of orthotropic heat conductivity of the CFRP composite on the ice melting process and heat transfer. Movement of the ice-water interface, the melted zone thickness and the melted zone area on CFRP composite are investigated on the three-dimensional electrothermal de-icing unit. The effects of thermal properties of substrate on the temperature distribution of the ice-airfoil interface are analyzed. The computational results show that the thermal properties of substrates affect the temperature on the ice-airfoil interface, the temperature distribution in the substrate, ice melting area, ice melting rate and ice melting volume significantly. The time that ice starts to melt on the CFRP composite substrate is earlier than that on the metal substrate. However, it takes more time for the ice to melt completely on the ice-CFRP interface than that on the ice-metal inter-face. The orthotropic heat conductivity of CFRP composite results in strong directivity of the melting area on the ice-CFRP in-terface. A ratio parameter is defined to represent the matching degree of substrate materials and geometry model of de-icing system. The simulation model can be applied to study electrothermal de-icing system of nacelle inlet and airfoil made of composite. The results in present work is also helpful to predict the change of temperature during de-icing process and provide guidelines for the optimizing the electrothermal de-icing system to reduce power consumption according to the fiber structure of composite.

scholarly journals PVT based solar assisted ground source heat pump system: Modelling approach and sensitivity analyses

Solar Energy ◽  
2019 ◽  
Vol 193 ◽  
pp. 37-50 ◽  
Author(s):  
Evangelos I. Sakellariou ◽  
Andrew J. Wright ◽  
Petros Axaopoulos ◽  
Muyiwa A. Oyinlola
Keyword(s):  
Heat Pump ◽  
Sensitivity Analyses ◽  
System Modelling ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Modelling Approach
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