It is difficult to understand turbulent combustion, because the combustion process is very complex and unsteady. One of the useful parameters for discussion of the unsteady flame behaviors is the flame stretch rate, which is evaluated by local flame curvature and strain rate. In this study, we conducted simultaneous OH-PLIF/Stereo PIV measurements of turbulent premixed flames. Flame shape and flow field were obtained. Then, local flame curvature and strain rate were discussed. The turbulent flame was established by a cyclone-jet combustor for propane/air mixtures. The main jet velocity was U m = 10, 30 m/s, and the equivalence ratio was m = 0.75, 0.90. The equivalence ratio of the cyclone jet was the same as that of the main jet, but the velocity of the cyclone jet was the constant of 10 m/s. It was found that the variation of flame curvature was large when the main jet velocity was high. Difference between curvature convex to unburned gas and curvature convex to burned gas was relatively small. Frequency of larger strain rate was high when the main jet velocity was large and equivalence ratio was small. It is suggested that the local flame extinction could be caused by the large strain rate because the local flame extinction occurs more frequently. At all conditions, compared with the positive strain rate, the frequency of negative strain rate was high.
Absorption and oxidation of medium-chain triglyceride (MCT) and long-chain triglyceride (LCT) infused in vivo into intestinal loops (Thiry-Vella loop) were studied. Thiry-Vella loops were formed in rat peritoneum using 20cm of jejunum resected from the same animal, both ends being attached open at the peritoneal wall. Thus each prepared loop was used as an in vivo intestine system free from bile and pancreatic juice. Normal absorbability in each loop was confirmed by infusion of a [14C]glucose. Three hours' cumulative absorption of [14C]MCT and [14C] LCT infused into the loop was assayed. The absorption rate of [14C] MCT was significantly higher than that of [14C] LCT, being Key Words medium-chain triglyceride, long-chain triglyceride, Thiry-Vella loop, energy metabolism, absorption.
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