The heat transfer coefficient and pressure drop during g as cooling process of CO(R-744)in a horizontal tube were investigated experimentally. The experiments were conducted withoutoil in the refrigerant loop. The mai...
The heat transfer coefficient and pressure drop during g as cooling process of CO(R-744)in a horizontal tube were investigated experimentally. The experiments were conducted withoutoil in the refrigerant loop. The main components of the refrigerant loop are a receiver, avariable-speed pump, a mass flow meter, a pre-heater and a gas cooler(test section). The waterloop consists of a variable speed pump, an isothermal tank, and a flow meter. The refrigerant,circulated by the variable-speed pump, condenses in the inner tube while water flows in theannulus. The gas cooler is 6000 mm in length, and it is divided into 12 subsections. The pressuredrop of CO in the gas cooler shows a relatively good agreement with those predicted byBlasius’s correlation. The local heat transfer coefficient of CO agrees well with the correlationby Bringer-Smith. However, at the region near Pseudo -critical temperature, the experimentsindicate higher values than the Bringer-Smith correlation. Based on the experimental datapresented in this paper, a new correlation to predict the heat transfer coefficient of supercriticalCO during in-tube cooling was developed. The deviation between the experimental values andthe values predicted by the new correlation is within 18%.
This paper reviews different types of air-silica photonic crystal fibers (PCFs), discusses their novel properties, and reports recent advances in PCF components and sensors as well as techniques for splicing PCFs to s...
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This paper reviews different types of air-silica photonic crystal fibers (PCFs), discusses their novel properties, and reports recent advances in PCF components and sensors as well as techniques for splicing PCFs to standard telecomm fibers.
Purpose Anthocyanin is a natural plant pigment and potent *** investigated its actions and antioxidant properties on benign prostatic hyperplasia using a rat model. Materials and Methods thirty male rats were divided ...
Purpose Anthocyanin is a natural plant pigment and potent *** investigated its actions and antioxidant properties on benign prostatic hyperplasia using a rat model. Materials and Methods thirty male rats were divided into 5 experimental groups the control,
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