Flow characteristics in the entrance of plate-fin heat exchanger have been investigated by means of particle image velocimetry (PIV). The flow field was measured using the two-frame cross-correlation technique. Stream...Flow characteristics in the entrance of plate-fin heat exchanger have been investigated by means of particle image velocimetry (PIV). The flow field was measured using the two-frame cross-correlation technique. Streamline and velocity contour graphs at different cross-sections were obtained in the experiment. The experimental results indicate that flow maldistribution in the conventional header is very serious, while the improved header configuration with punched baffle can effectively improve the uniformity. The flow maldistribution parameter in plate-fin heat exchanger has been reduced from 1.21 to 0.21, and the ratio of the maximum velocity to the minimum is reduced from 23.2 to 1.8 by install-ing the punched baffle. The results suggest room for the optimum design of plate-fin heat exchanger.展开更多
Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners hav...Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners have paved the way for a unilateral media structure not hearing the voice of others/local people. It is seen that the main stream media becomes more and more under direction of capital groups. Because of the effects created by the Second World War II, also war and media relation has gain different dimensions. Together with this differentiation, a new notion was born in the field of journalism during occupation period of the lraq by the USA--Embedded Journalism This notion, called as ＂embedded journalism＂ in English can be translated as ＂yapismislik--attachment＂, ＂gomulmusluk---embeddedness＂, and ＂yamanmis-patched＂ in Turkish. In this connection, developments which have also been realized in the media economics in line with globalization process as seen all other aspects of life, changing of ownership structure in the media, and increase of concentrations, monopolization will be scrutinized in our study in addition how the fact of embedded journalism has affected the most important mission of journalism, objectivity within the framework of relations between journalism and government.展开更多
基金Supported by the Foundation for Excellent Doctoral Dissertation Author by Ministry of Education of China (No.199933).
文摘Flow characteristics in the entrance of plate-fin heat exchanger have been investigated by means of particle image velocimetry (PIV). The flow field was measured using the two-frame cross-correlation technique. Streamline and velocity contour graphs at different cross-sections were obtained in the experiment. The experimental results indicate that flow maldistribution in the conventional header is very serious, while the improved header configuration with punched baffle can effectively improve the uniformity. The flow maldistribution parameter in plate-fin heat exchanger has been reduced from 1.21 to 0.21, and the ratio of the maximum velocity to the minimum is reduced from 23.2 to 1.8 by install-ing the punched baffle. The results suggest room for the optimum design of plate-fin heat exchanger.
文摘Inclination of capital groups--which realize widening impact field of media-to media sector due to relationships based on interests, and relationships/dilemmata between the governing parties and the capital owners have paved the way for a unilateral media structure not hearing the voice of others/local people. It is seen that the main stream media becomes more and more under direction of capital groups. Because of the effects created by the Second World War II, also war and media relation has gain different dimensions. Together with this differentiation, a new notion was born in the field of journalism during occupation period of the lraq by the USA--Embedded Journalism This notion, called as ＂embedded journalism＂ in English can be translated as ＂yapismislik--attachment＂, ＂gomulmusluk---embeddedness＂, and ＂yamanmis-patched＂ in Turkish. In this connection, developments which have also been realized in the media economics in line with globalization process as seen all other aspects of life, changing of ownership structure in the media, and increase of concentrations, monopolization will be scrutinized in our study in addition how the fact of embedded journalism has affected the most important mission of journalism, objectivity within the framework of relations between journalism and government.
