关键词: 超高静压, 传压介质, 压致升温, 热损失

Abstract:

The compression heating characteristics of three pressure-transmitting f1uids 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 ℃ IMPa with the increase in pressure , while that of water slightly changes from 0. 026 to 0.028 ℃ /MPa , and that of ethanoldecreases 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.

Key words: high hydrostatic pressure, pressure-transmitting fluid, compression heating, heat loss