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Full-Text Articles in Mechanical Engineering
Passive Thermal Management Using Phase Change Materials, Yash Yogesh Ganatra
Passive Thermal Management Using Phase Change Materials, Yash Yogesh Ganatra
Open Access Theses
The trend of enhanced functionality and reducing thickness of mobile devices has led to a rapid increase in power density and a potential thermal bottleneck since thermal limits of components remain unchanged. Active cooling mechanisms are not feasible due to size, weight and cost constraints. This work explores the feasibility of a passive cooling system based on Phase Change Materials (PCMs) for thermal management of mobile devices. PCMs stabilize temperatures due to the latent heat of phase change thus increasing the operating time of the device before threshold temperatures are exceeded. The primary contribution of this work is the identification …
Analysis Of The Impact Of Early Exhaust Valve Opening And Cylinder Deactivation On Aftertreatment Thermal Management And Efficiency For Compression Ignition Engines, Leighton Edward Roberts
Analysis Of The Impact Of Early Exhaust Valve Opening And Cylinder Deactivation On Aftertreatment Thermal Management And Efficiency For Compression Ignition Engines, Leighton Edward Roberts
Open Access Theses
In order to meet strict emissions regulations, engine manufacturers have implemented aftertreatment technologies which reduce the tailpipe emissions from diesel engines. The effectiveness of most of these systems is limited when exhaust temperatures are low (usually below 200°C to 250°C). This is a problem for extended low load operation, such as idling and during cold start. Use of variable valve actuation, including early exhaust valve opening (EEVO) and cylinder deactivation (CDA), has been proposed as a means to elevate exhaust temperatures. This thesis discusses a research effort focused on EEVO and CDA as potential enablers of exhaust gas temperature increase …
Transport In Ultra-Thin Heat Pipes For Low Power Applications, Yashwanth Yadavalli
Transport In Ultra-Thin Heat Pipes For Low Power Applications, Yashwanth Yadavalli
Open Access Theses
Heat pipes and vapor chamber heat spreaders offer a potential solution to the increasing thermal management challenges in thin-form-factor mobile computing platforms, where efficient spreading is required to simultaneously prevent overheating of internal components and formation of hot regions on the device exterior surfaces. The operating conditions for such applications are also characterized by low input heat fluxes, which in combination with the geometric constraints, give rise to unique performance limitations that require examination. This thesis aims to characterize the steady-state and transient heat pipe performance limitations unique to such ultra-thin form factors, and characterizes the key heat transfer mechanisms …