Papers by Keyword: Calorimetric Method

Abstract: In bioreactor, it often monitors some procedure parameters such as temperature, pH , and dissolved oxygen values to monitor fermentation process, but these parameters may be instability and delayed. Calorimetry hasn’t distinctiveness, virulence and doesn’t be sensitive to electrochemistry. So it can be used in some kind of culture fluid, even so it can be used in muddy fluid that photometers can’t be used in. Relative to other monitoring ways, calorimetry’s response time is short, so calorimetry is well suited to monitor bioprocesses on line. Calorimetry only needs normal standardize monitoring units, and this normal standardize monitoring units is be widely used in industry. Calorimetry as a simple alternative is beginning to be used in monitor bio-fermentation process.

Abstract: High speed machining (HSM) is finding wider applications due to its economic advantages, such as faster material removal rates, and its technological merits, such as improved surface finish. Nevertheless, the application of HSM also brings about some undesirable results. For example, the tool life and surface integrity of a machined component are greatly affected by the large amount of heat generated, but heat dissipation during an HSM has not been well understood. This paper aims to achieve a quantitative understanding of the heat dissipation in HSM using a bar turning configuration. Based on the calorimetric method and utilizing water as the heat transfer medium, the temperature rise in water was measured to determine the fractions of heat dissipated into the chips, the tool and the workpiece during machining. The obtained results show that the chips take the largest portion of the heat generated and this fraction increases with the increase in feed.

Abstract: Cutting heat dissipation in high speed milling of medium carbon steel was experimentally investigated based on calorimetric method under the cooling conditions of hard cutting, applying compressed air or water. Special containers holding water medium were designed to collect cutting heat in chips, workpiece and tool respectively, and the heat distribution ratio in these components was calculated in terms of the temperature varieties of each component. The results were compared with the cutting power which came from the cutting forces measured.