Phase change materials (PCMs) are materials that absorb or release large amount of thermal energy due to high latent heat energy at almost a constant temperature while undergoing phase changes. Different types of PCMs in combination of nanopartiocles have been used to augument the heat transfer characteritics of the heat sink. To evaluar the heat transfer characteristics of heat sink wall and the coolant, thermal resistance of the heat sink is considered to be the main parameter.   Many investigators and numerous studies proposed many techniques for thermal management of electronic devices such as the use of heat pipes, extended surfaces, pahse change materials integrated in heat pipes and extended surfaces, air circulating fans. It is very hard for electronic devices to maintain high temperature for log operating hours. Then, it is very important to ensure the relaiability and performance of cooling system and electronic chips of electronic systems. Amongst the various PCMs available, bio-based PCMs seem to stand out due to their melting temperatures varying over a wider temperature spectrum (-40°C to 151°C), higher latent heat density and higher thermal stability when compared to its organic paraffin wax and inorganic counterparts. Bio-based PCMs generally have poor thermal conductivity, which deteriorates the pace of charging/discharging due to reduced heat transfer rates. Hence, nanoparticles and additives usually enhances the rate of heat transfer due to the addition of metallic and non-metallic nanoparticels that augument the heat transfwer characteistics of the cooling process. Additives such as Graphene Nanoplatelets (GNPs) are added to improve heat transfer performance of such PCM’s through enhancing thermal conductivity. To the best of our knowledge, no study has been carried out using GnPs to enhance the thermal conductivity of bio-based PCM produced by the PureTemp Company. This paper investigates experimentally the effects of adding GnPs with different Surfactants namely, sodium dodecyl sulfate (SDS) , Sodium dodecylbenzenesulfonate (SDBS) and Sodium stearoyl lactylate (SSL) to PureTemp PCM and using it as a heat sink to absorb the heat from a high temperature object (a heater). This paper also investigates the effect of surfactants concentration on the stability of Nano-PCM aiming to find the best combination to be used in thermal management systems.  
Finally, the results indicated that adding GnPs to the bio-based PCM increases cooling performance of the heat sink.PCM based heat sinks are coming up as one of the most effective techniques for thermal management systems of elctronics such as laptops and tablets.   
 


Effect of Adding Graphene Nano-Platelets With Surfactants on Bio-Based PCM Characteristics and its Cooling Performance

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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