Development Of Heat Sink Research Articles

Persistently self-powered wearable thermoelectric generator enabled by phase-change inorganics as the heat sink

Wearable electronics improve our lives such as work efficiency, health and lifestyle. Wearable thermoelectric generators (w-TEGs) offer a persistent solution to the power unit, but the low efficiency and toxicity of which limited its widespread application. The development of heat sink that increases the temperature difference is the key to improve thermoelectric conversion efficiency. In this work, an environmentally friendly and high-performance flexible inorganic phase change material (IPCM) was developed as the heat-sink of w-TEG. Thanks to the large latent heat of the phase change near 300 K, calcium chloride hexahydrate (CaCl2•6H2O) embedded in organics acts as an excellent heat reservoir enabling a persistent flexible sink for efficient w-TEGs. It turns out an over 35 μW/cm2 output lasting for 1.5 h (motionless) or over 8 h (motion) for a wrist w-TEG. Moreover, such a heatsink is resettable due to the phase-change reversibility, enabling a potential solution for persistently powering wearable sensors and functional devices.

Development of Heat sink from Aluminium Silicon Carbide for Electrical and Electronic Applications

Heat sinks play a vital role in dissipating heat in electrical and electronic equipment. The heat sink device influences the overall efficiency, cost, and size of this equipment. Due to the development of the ever-evolving electronics market, new materials with a good thermal conductivity that can absorb and disperse heat away from high temperature and lightweight are sought for. As a result of this, searching for new materials with the tended properties to replace the traditional material is the focus of this work. The candidate materials choosing is aluminium silicon carbide composite because of its properties similar to the one needed for the heat sink. The aluminium silicon carbide composite was processed with different grits silicon carbide. Thereafter, additives with different oxide composition of calcium, zinc and chromium through the processing of stir and mechanical casting were used for the production of the samples. Nine samples in all were produced for the analysis and properties testing. The results show that density, electrical conductivity and thermal conductivity of produced samples are closely similar to the control sample. This preliminary result indicated that the developed heat sink sample could replace the traditional one.

Development of heat sink with ionic wind for LED cooling

A heat sink with ionic wind has been developed in this study for a new cooling device of a Light Emitting Diode (LED). The characteristics of the ionic wind using wire to parallel-plate-electrodes were analyzed using the Computational Fluid Dynamics (CFD) technique suggested in this study. Also, the cooling performance of the heat sink applied by the impinging flow of the ionic wind was investigated by parametric studies. The CFD results were verified from the experimental results of the ionic wind velocity and temperature. A developed prototype of the heat sink with the ionic wind was then manufactured and tested for its cooling performance. Finally, the advantages of the heat sink with the ionic wind for cooling the LED were confirmed.

Development of a Heat Sink With Periodic Asymmetric Structures Using Grayscale Lithography and Deep Reactive Ion Etching

This letter describes the fabrication and development of a novel heat sink for two-phase liquid cooling of electronics. The surface of the heat sink is asymmetric in the form of sawtooth ratchets with the long slope at an angle of 24° and is enhanced with reentrant cavities, which act as vapor trapping sites. The sawtooth ratchets were fabricated using grayscale lithography and deep reactive ion etching and the reentrant cavities using anisotropic etching. In pool boiling experiments with deionized water, surface asymmetry results in a net force imbalance acting on the vapor bubbles departing from the reentrant cavities, thereby resulting in bubbles departing at an angle with instantaneous velocities in excess of 600 mm/s. This novel surface developed demonstrates the ability to effect lateral motion of bubbles and the liquid in vicinity.