scholarly journals Best Practices for Thermal Modeling in Microelectronics with Natural Convection Cooling: Sensitivity Analysis

2021 ◽  
Vol 10 (02) ◽  
pp. 15-33
Author(s):  
Mamadou Kabirou Touré ◽  
Papa Momar Souaré ◽  
Julien Sylvestre
Keyword(s):  
Sensitivity Analysis ◽  
Natural Convection ◽  
Best Practices ◽  
Thermal Modeling ◽  
Convection Cooling

Thermal Modeling of Remote Radio Head Units

2015 ◽  
Author(s):  
Manasa Sahini ◽  
Betsegaw Gebrehiwot ◽  
Dereje Agonafer ◽  
Rocky Colapietro
Keyword(s):  
Natural Convection ◽  
Hot Spots ◽  
Thermal Modeling ◽  
Air Flow ◽  
Inlet Temperature ◽  
Fixed Amount ◽  
A Cell ◽  
Computational Fluid Dynamics Cfd ◽  
Convection Cooling ◽  
Cell Tower

Thermal modeling of concealed Remote Radio Head (RRH) units which are placed on a cell tower is the main interest of this paper. RRH units which dissipate fixed amount of heat are modeled in higher ambient temperature. The effect of creating an enclosure on the open air assembly of RRH units is studied. The aim of this study is to analyze if concealment of the RRH units is possible under natural convection for cooling under boundary conditions with inlet temperature 55°C, solar loading and wind. Also, the study has been made to investigate if stacking of one, two, or three concealed sections is possible under natural convection cooling process. Various configurations were modeled and analyzed using a computational fluid dynamics (CFD) tool. Different temperature profiles are reported. An enclosure has been created and the operating temperatures of the enclosed model and an open model are compared. After studying the air flow pattern in the model, specific design modifications, like placing baffles on top of each RRH unit, are suggested for proper air flow management thereby facilitating efficient thermal management inside the enclosure. Also, addition of baffles helped in removing the hot spots in the model. Stacking concealed sections poses a challenge since hot exhaust air from a lower section may enter the air inlets of top sections. Thereby, higher surface temperatures on RRH units in the upper sections are observed. Orientation of the upper section has been changed to address this issue. Results show that with proper airflow management and arrangement of sections, it is possible to have three sections one on top of the other.

Fundamental Issues and Recent Advancements in Analysis of Aircraft Brake Natural Convective Cooling

1998 ◽  
Vol 120 (4) ◽  
pp. 840-857 ◽  
Author(s):  
M. P. Dyko ◽  
K. Vafai
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Flow Field ◽  
Three Dimensional ◽  
Convective Cooling ◽  
Cooling Flow ◽  
Physical Mechanisms ◽  
Braking System ◽  
Flow And Heat Transfer ◽  
Convection Cooling

A heightened awareness of the importance of natural convective cooling as a driving factor in design and thermal management of aircraft braking systems has emerged in recent years. As a result, increased attention is being devoted to understanding the buoyancy-driven flow and heat transfer occurring within the complex air passageways formed by the wheel and brake components, including the interaction of the internal and external flow fields. Through application of contemporary computational methods in conjunction with thorough experimentation, robust numerical simulations of these three-dimensional processes have been developed and validated. This has provided insight into the fundamental physical mechanisms underlying the flow and yielded the tools necessary for efficient optimization of the cooling process to improve overall thermal performance. In the present work, a brief overview of aircraft brake thermal considerations and formulation of the convection cooling problem are provided. This is followed by a review of studies of natural convection within closed and open-ended annuli and the closely related investigation of inboard and outboard subdomains of the braking system. Relevant studies of natural convection in open rectangular cavities are also discussed. Both experimental and numerical results obtained to date are addressed, with emphasis given to the characteristics of the flow field and the effects of changes in geometric parameters on flow and heat transfer. Findings of a concurrent numerical and experimental investigation of natural convection within the wheel and brake assembly are presented. These results provide, for the first time, a description of the three-dimensional aircraft braking system cooling flow field.

Flow Channelization Method to Enhance Transformer Radiator Cooling Capacity

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
Subhashish Dasgupta ◽  
Anurag Nandwana ◽  
K. Ravikumar
Keyword(s):  
Natural Convection ◽  
Heat Exchangers ◽  
Fluid Dynamic ◽  
Cost Effective ◽  
Cooling Capacity ◽  
Structural Features ◽  
Cfd Analysis ◽  
Cooling Process ◽  
Effective Technology ◽  
Convection Cooling

Abstract Most oil-cooled equipment like transformers are provided with radiators or heat exchangers, for the heated oil to exchange heat with the surrounding air by natural convection cooling, assisting the overall cooling process. While such radiators are effective accessories in controlling equipment temperature rise, it is ever desirable to further enhance the cooling capacity by design modifications or incorporating simplistic and cost-effective cooling technologies. In this study, computational fluid dynamic (CFD) analysis has been performed to evaluate the possibility of improving radiator performance by flow channelizing structures. Significant benefits (up to 17% increase in heat transfer coefficient) of imposing such structures, like a top chimney and an enclosure surrounding the radiator, were obtained. Although several past studies have confirmed that natural convection cooling effect can be intensified by flow channelization, the phenomenon is unique to a particular application. Given the wide variety in applications, in terms of shape, size, and structural features, it is necessary to study the effect in a given application of interest. This study points to a new direction in enhancing the cooling capacity of transformer radiators, inducing flow channelization, an easy-to-implement and cost-effective technology. Further, the study offers interesting learnings regarding flow channelization effects, which are invaluable guidelines for designers of future radiators.

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