超高静压下传压介质压致升温的规律  

Compression Heating Characteristics of Pressure-Transmitting Fluids in High Hydrostatic Pressure Processing

作　　者：王标诗[1] 李汴生[1] 黄娟[1] 曾庆孝[1] 李琳[1] 

机构地区：[1]华南理工大学轻工与食品学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2007年第12期132-136,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金重点项目(20436020);广东省自然科学基金资助项目(05006597)

摘　　要：通过将温度探头伸入高压腔内在线测定了3种传压介质（癸二酸二辛酯、水、无水乙醇）的温度变化情况,研究它们在不同条件下的压致升温规律.结果表明：在试验条件下,癸二酸二辛酯的压致升温值随压力的增加由0.089℃/MPa降至0.068℃/MPa,且随初始温度的增加而降低;水的压致升温值随压力的增加基本不变,稳定在0.026-0.028℃/MPa之间,且随初始温度的增加而略有增加;无水乙醇的压致升温值受压力影响大于水而小于癸二酸二辛酯,随压力增加由0.082℃/MPa降至0.075℃/MPa,初始温度对其影响大于水,但乙醇压致升温值随着其质量分数的增加而增加.通过聚四氟乙烯套筒和不锈钢套筒模拟不同的热损失条件时,在保压过程中前者对癸二酸二辛酯的保温效果明显高于后者.The compression heating characteristics of three pressure-transmitting fluids such as dioctyl sebacate, water and ethanol in high hydrostatic pressure processing were investigated via the on-line measurement of temperature by inserting the probe into the high-pressure cavity. The results show that （ 1 ） the compression heating value of dioctyl sebacate decreases from 0. 089 to 0. 068 ℃/MPa with the increase in pressure, while that of water slightly changes from 0. 026 to 0. 028℃/MPa, and that of ethanol decreases from 0. 082 to 0. 075℃/100 MPa; （ 2 ） the influence of pressure on the compression heating value of ethanol is greater than that on water but slightly smaller than dioctyl sebacate; （3） with the increase in the initial temperature, the compression heating value of dioctyl sebacate decreases, while that of water slightly increases; （4） the effect of the initial temperature on the compression heating value of ethanol is greater than that of water, which increases with the mass fraction; and （5） teflon liner has greater heat preservation effect on dioctyl sebacate than stainless steel liner during the pressure-holding process in different simulated heat loss conditions.

关 键 词：超高静压 传压介质 压致升温 热损失 

分 类 号：TS201.1[轻工技术与工程—食品科学] TQ021.2[轻工技术与工程—食品科学与工程]