Abstract
An experimental investigation was conducted, both thermally and visually, on a three-dimensional flat-plate oscillating heat pipe (3D FP-OHP) to characterize its performance under localized heat fluxes while operating in the bottom heating mode and charged with acetone at a filling ratio of 0.73. The cooling area was held constant and three heating areas of 20.16 [Formula: see text], 11.29 [Formula: see text], and 1.00 [Formula: see text] were investigated, respectively. It was found that as the heating area was reduced and higher heat fluxes were imposed, the thermal resistance increased and the amplitude of thermal oscillations in the evaporator increased and became more chaotic. Using neutron radiography, it was observed that fluid oscillations did not occur in outer channels located away from the region of local heating. Although the thermal resistance increased during localized heating, a maximum heat flux of 180 W/[Formula: see text] was achieved with the average evaporator temperature not exceeding [Formula: see text].
Highlights
Due to the ongoing miniaturization of electrical components and the general advancement of technology, the thermal management of high heat fluxes is becoming a pivotal requirement for product development and application
It was found that while holding the condenser area constant, the reduction in heating area increased the thermal resistance of the 3D FP-oscillating heat pipe (OHP)
While it was shown that the reduction of the heating area generally decreased the thermal performance of the 3D flat-plate oscillating heat pipe (FP-OHP), the contrary was found at higher heat inputs when a heater that perfectly mated with the width of the internal channel array, as opposed to the overall width of the 3D FP-OHP, was implemented
Summary
Due to the ongoing miniaturization of electrical components and the general advancement of technology, the thermal management of high heat fluxes is becoming a pivotal requirement for product development and application. A typical OHP allows for the working fluid to flow within a single plane This traditional design limits the OHP channel density (channels/unit volume) and the thermal resistance of the heat pipe at higher heat fluxes. Meena et al [4] explored the effects of varying the evaporator length on the operational limit of an OHP with check valves (CLOHP/CV) with various working fluids at a filling ratio of 50%. It was found that when the evaporator length increased, the critical heat flux decreased for all investigated working fluids. Zhang and Faghri [6] analytically predicted that the reduction of heating section length on an open-loop, tubular OHP reduces the thermal performance of the heat pipe as a result of decreased fluid movement. Using the novel capabilities of neutron radiography, the internal fluid dynamics and void fraction distribution were visualized, and these results will be presented
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