Experimental investigation on TiO2 nanoparticle migration from refrigerant–oil mixture to lubricating oil during refrigerant dryout |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China;1. Gdansk University of Technology, Faculty of Mechanical Engineering, Department of Energy and Industrial Apparatus, Narutowicza 11/12, 80-233 Gdansk, Poland;2. Norwegian University of Science and Technology, Department of Energy and Process Engineering, N-7491 Trondheim, Norway;1. Institute of Psychology and Behavior, Henan University, Kaifeng 475004, China;2. CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing, China;3. Department of Psychology, Shanghai University of Sport, Shanghai, China;1. Ningbo Institute of Technology, Zhejiang University, No.1 Qianhu South Rd, Ningbo 315100, China;2. Odessa National Academy of Food Technologies, 112 Kanatna str., Odessa 65039, Ukraine |
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| Abstract: | The application of nanorefrigerant–oil mixture in refrigeration system requires continuous circulation of nanoparticles; however, only a small part of nanoparticles circulate by migration from the mixture to vapor within refrigerant dryout process. This study points out a more important nanoparticle circulation way by migration from bulk refrigerant–oil mixture to oil excess layer, and quantitatively evaluate the mixture-to-oil migration ratio affected by oil mass fraction, nanoparticle mass fraction and heat flux. The nanorefrigerant–oil mixture is TiO2/R141b/NM56; experimental conditions cover oil mass fraction of 5%–20%, nanoparticle mass fraction of 0.2%–1.0%, and heat flux of 10–100 kW m−2; the mixture-to-oil migration ratio is measured by absorbance method. The results show that mixture-to-oil migration ratio ranges within 0.388–0.969, and increases averagely by 51.8%, 28.3% and 8.0% with increasing oil mass fraction, reducing nanoparticle mass fraction and lowering heat flux over the whole range of present conditions, respectively. |
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