CAJ | 학술논문

设计了2种分别由6根管子组成的不同管束排列在沸腾室中.实验以去离子水为介质,研究了常压及低于大气压下压力对光滑管束和烧结表面多孔管束核池沸腾传热性能的影响.实验结果表明,在真空条件下这2种管束的沸腾传热系数与在常压条件下一样随着压力值的升高而增大.在相同的操作参数条件下,与光滑管相比较,当压力值在10～100 kPa之间变化时,烧结表面多孔管的传热系数提高了0.2～4倍.此外,实验数据还表明在真空条件下烧结表面多孔管及光滑管均存在管束效应.
설계료2충분별유6근관자조성적불동관속배렬재비등실중.실험이거리자수위개질,연구료상압급저우대기압하압력대광활관속화소결표면다공관속핵지비등전열성능적영향.실험결과표명,재진공조건하저2충관속적비등전열계수여재상압조건하일양수착압력치적승고이증대.재상동적조작삼수조건하,여광활관상비교,당압력치재10～100 kPa지간변화시,소결표면다공관적전열계수제고료0.2～4배.차외,실험수거환표명재진공조건하소결표면다공관급광활관균존재관속효응.
Two types of tube bundles are designed,which are, respectively,composed of six tubes arranged in the boiling chamber.The nucleate pool boiling performance of smooth tube bundles and sintered porous surface tube bundles with deionized water as a medium are experimentally studied at atmospheric and sub-atmospheric pressures, respectively.The experimental results indicate that the boiling heat transfer coefficients of the two types of tube bundles increase with the increase in pressure under vacuum conditions as they behave under ordinary pressure.As the pressure varies from 10 to 100 kPa,it also can be seen that the heat transfer coefficient of the sintered porous surface tube is increased by 0.2 to 4 times compared with the smooth one under the same operating parameters.In addition,the experimental data show that a definite bundle effect exists in both sintered porous surface tubes and smooth tubes under vacuum conditions.