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흡수식 시스템 적용을 위한 이성분 나노 에멀젼 입도 및 열전도도 측정
설혜연(Heayoun Sul),정정열(Jung-Yeul Jung),구준모(Junemo Koo),강용태(Yong Tae Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Binary nanoemulsions, oil-droplet suspensions in binary solution (H₂O/LiBr), are developed to enhance the heat and mass transfer performance of absorption refrigeration cycles. In this study, a novel two-step method was proposed to prepare the stable oil-in-binary solution (O/S) emulsion. To stabilize the nanoemulsions in a strong electrolyte, polymer is used as a steric stabilizer. The droplet size and the thermal conductivity of binary nanoemulsions are measured by the dynamic light scattering method and the transient hot-wire method, respectively. It was found that the thermal conductivity of the binary nanoemulsion is inversely proportional to the emulsion size.
Stretchable Skin-Like Cooling/Heating Device for Artificial Thermal Sensation
Munju Kim,Jinwoo Lee,Heayoun Sul,Wonha Lee,Kyun Rok Pyun,Inho Ha,Dongkwan Kim,Hyojoon Park,Hyeonjin Eom,Yeosang Yoon,Jinwook Jung,Doungjun Lee,Seunghwan Ko 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5
Artificial reproduction of accurate/controllable thermal sensation to haptic signal is required to construct a more realistic virtual reality(VR) environment. In this study, a skin-like, highly soft and stretchable bi-functional thermo-haptic device is reported with a single device structure. The skin-like thermo-haptic(STH) device can actively cool down and heat up its deformable surface to mimic desirable thermal sensation. This new type of STH device is expected to offer potential implications to provide valuable thermal information for VR technology and medical thermal treatment.