换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)（heatexchanger），是(shi)将热(re)(re)流体的(de)(de)部(bu)分热(re)(re)量传递给冷(leng)流体的(de)(de)设(she)备(bei)，又称热(re)(re)交换(huan)(huan)(huan)(huan)器(qi)(qi)(qi)(qi)(qi)。换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)在化(hua)工(gong)(gong)(gong)(gong)、石油、动力、食品(pin)及(ji)其(qi)它许多工(gong)(gong)(gong)(gong)业生产(chan)中(zhong)(zhong)占有重要(yao)地位，其(qi)在化(hua)工(gong)(gong)(gong)(gong)生产(chan)中(zhong)(zhong)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)可(ke)(ke)作(zuo)为加(jia)(jia)热(re)(re)器(qi)(qi)(qi)(qi)(qi)、冷(leng)却器(qi)(qi)(qi)(qi)(qi)、冷(leng)凝(ning)器(qi)(qi)(qi)(qi)(qi)、蒸(zheng)发(fa)器(qi)(qi)(qi)(qi)(qi)和(he)再沸器(qi)(qi)(qi)(qi)(qi)等，应用(yong)(yong)之广。创(chuang)(chuang)阔(kuo)科(ke)技(ji)在不(bu)断的(de)(de)研发(fa)创(chuang)(chuang)新(xin)现已适(shi)用(yong)(yong)于不(bu)同(tong)介质、不(bu)同(tong)工(gong)(gong)(gong)(gong)况(kuang)、不(bu)同(tong)温(wen)(wen)度、不(bu)同(tong)压力的(de)(de)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)，结构型式也(ye)不(bu)同(tong)，然(ran)而(er)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)在石油、化(hua)工(gong)(gong)(gong)(gong)、轻工(gong)(gong)(gong)(gong)、制药、能源等工(gong)(gong)(gong)(gong)业生产(chan)中(zhong)(zhong)，常(chang)(chang)常(chang)(chang)用(yong)(yong)作(zuo)把(ba)低(di)温(wen)(wen)流体加(jia)(jia)热(re)(re)或(huo)者把(ba)高温(wen)(wen)流体冷(leng)却，把(ba)液(ye)体汽化(hua)成(cheng)蒸(zheng)汽或(huo)者把(ba)蒸(zheng)汽冷(leng)凝(ning)成(cheng)液(ye)体。换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)既可(ke)(ke)是(shi)一(yi)种单元设(she)备(bei)，如(ru)加(jia)(jia)热(re)(re)器(qi)(qi)(qi)(qi)(qi)、冷(leng)却器(qi)(qi)(qi)(qi)(qi)和(he)凝(ning)汽器(qi)(qi)(qi)(qi)(qi)等；也(ye)可(ke)(ke)是(shi)某一(yi)工(gong)(gong)(gong)(gong)艺(yi)设(she)备(bei)的(de)(de)组成(cheng)部(bu)分，如(ru)氨合(he)成(cheng)塔内的(de)(de)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)。换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)是(shi)化(hua)工(gong)(gong)(gong)(gong)生产(chan)中(zhong)(zhong)重要(yao)的(de)(de)单元设(she)备(bei)，根(gen)据(ju)统计，热(re)(re)交换(huan)(huan)(huan)(huan)器(qi)(qi)(qi)(qi)(qi)的(de)(de)吨位约占整(zheng)个工(gong)(gong)(gong)(gong)艺(yi)设(she)备(bei)的(de)(de)20%有的(de)(de)甚至高达30%，其(qi)重要(yao)性(xing)可(ke)(ke)想而(er)知(zhi)。创(chuang)(chuang)阔(kuo)科(ke)技(ji)制作(zuo)氢(qing)气换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)，微通(tong)道(dao)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)，印刷板式换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)，专业设(she)计加(jia)(jia)工(gong)(gong)(gong)(gong)。徐汇区紧(jin)凑型多结构微通(tong)道(dao)换(huan)(huan)(huan)(huan)热(re)(re)器(qi)(qi)(qi)(qi)(qi)

盖板(ban)上(shang)的容器(qi)(qi)(qi)(qi)内装有铂电极，用于加载(zai)电流(liu)。气(qi)液相(xiang)(xiang)微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)的研究(jiu)较之液液相(xiang)(xiang)微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)更少，所报道的微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)按照气(qi)液接触的方式(shi)可分为两类。T形液液相(xiang)(xiang)微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)一(yi)(yi)类是气(qi)液分别从两根微(wei)(wei)通(tong)道汇流(liu)进一(yi)(yi)根微(wei)(wei)通(tong)道，整个结构(gou)呈(cheng)T字形。由于在气(qi)液两相(xiang)(xiang)液中，流(liu)体(ti)的流(liu)动状态与(yu)泡罩塔类似，随着气(qi)体(ti)和液体(ti)的流(liu)速(su)变(bian)化出现(xian)了(le)气(qi)泡流(liu)、节涌流(liu)、环(huan)状流(liu)和喷(pen)射流(liu)等典型的流(liu)型，这一(yi)(yi)类气(qi)液相(xiang)(xiang)微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)被(bei)称(cheng)做微(wei)(wei)泡罩塔。另一(yi)(yi)类是沉(chen)降膜式(shi)微(wei)(wei)反(fan)(fan)应器(qi)(qi)(qi)(qi)，液相(xiang)(xiang)自上(shang)而下呈(cheng)膜状流(liu)动，气(qi)液两相(xiang)(xiang)在膜表面充分接触。郑(zheng)州(zhou)不锈钢(gang)微(wei)(wei)通(tong)道换热器(qi)(qi)(qi)(qi)微(wei)(wei)通(tong)道通(tong)过(guo)各向异性的蚀刻过(guo)程可完(wan)成加工新型换热器(qi)(qi)(qi)(qi)，创阔(kuo)科技。

创阔科(ke)技(ji)的(de)(de)微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)是一种采用(yong)特殊微(wei)加工(gong)技(ji)术制(zhi)造(zao)(zao)(zao)的(de)(de)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)。当(dang)(dang)量(liang)水(shui)(shui)(shui)力(li)直(zhi)径(jing)通(tong)(tong)(tong)常(chang)小于(yu)1mm。该换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)特点(dian)是单(dan)位体积换(huan)(huan)(huan)热(re)(re)(re)(re)量(liang)大(da)，耐高(gao)压，制(zhi)造(zao)(zao)(zao)难度(du)大(da)。在微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)设(she)计中，如果当(dang)(dang)量(liang)直(zhi)径(jing)过(guo)小时，可(ke)能需要(yao)关注微(wei)尺度(du)效应(ying)。此时，传(chuan)(chuan)统的(de)(de)宏观理(li)论公式(shi)不再(zai)适(shi)用(yong)于(yu)流(liu)动和传(chuan)(chuan)热(re)(re)(re)(re)。，我们(men)(men)将使用(yong)FLUENT制(zhi)作一个简单(dan)的(de)(de)微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)案例。当(dang)(dang)然，微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)当(dang)(dang)量(liang)直(zhi)径(jing)足以(yi)通(tong)(tong)(tong)过(guo)解(jie)决NS方(fang)程来模拟(ni)。2模型和网(wang)格。由于(yu)实际(ji)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)单(dan)元(yuan)(yuan)较(jiao)多，流(liu)道(dao)(dao)(dao)(dao)数量(liang)较(jiao)大(da)，本案按对称(cheng)面截取部分计算。换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)长度(du)60mm，宽(kuan)度(du)6mm，微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)高(gao)度(du)mm，宽(kuan)度(du)1mm(当(dang)(dang)量(liang)直(zhi)径(jing)mm)。全六面网(wang)格划分如下(xia)。网(wang)格节(jie)点(dian)总数为(wei)691096。3求(qiu)解(jie)设(she)置(zhi)在这种情况下(xia)，我们(men)(men)假设(she)介质(zhi)(zhi)在微(wei)通(tong)(tong)(tong)道(dao)(dao)(dao)(dao)换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)流(liu)道(dao)(dao)(dao)(dao)的(de)(de)流(liu)动状态(tai)为(wei)层流(liu)，所以(yi)选择层流(liu)模型，打开能量(liang)方(fang)程。我们(men)(men)为(wei)换(huan)(huan)(huan)热(re)(re)(re)(re)介质(zhi)(zhi)设(she)置(zhi)了两组水(shui)(shui)(shui)/水(shui)(shui)(shui)、气(qi)/水(shui)(shui)(shui)。水(shui)(shui)(shui)和空气(qi)是默认的(de)(de)。事实上(shang)，应(ying)根(gen)(gen)据温(wen)度(du)设(she)置(zhi)相应(ying)的(de)(de)值。换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)本体由钢(gang)制(zhi)成，不考虑(lv)单(dan)元(yuan)(yuan)之(zhi)间(jian)(jian)连接(jie)造(zao)(zao)(zao)成的(de)(de)传(chuan)(chuan)热(re)(re)(re)(re)阻力(li)（单(dan)元(yuan)(yuan)与单(dan)元(yuan)(yuan)之(zhi)间(jian)(jian)的(de)(de)集成模型）。换(huan)(huan)(huan)热(re)(re)(re)(re)器(qi)(qi)(qi)的(de)(de)入(ru)(ru)口(kou)(kou)设(she)置(zhi)为(wei)速度(du)入(ru)(ru)口(kou)(kou)边(bian)界，出(chu)口(kou)(kou)设(she)置(zhi)为(wei)压力(li)边(bian)界。根(gen)(gen)据以(yi)下(xia)值设(she)置(zhi)，介质(zhi)(zhi)流(liu)向为(wei)逆流(liu)。除(chu)上(shang)下(xia)边(bian)界外，其余(yu)为(wei)绝缘墙。换(huan)(huan)(huan)热(re)(re)(re)(re)介质(zhi)(zhi)序号(hao)名称(cheng)类型值温(wen)度(du)水(shui)(shui)(shui)/水(shui)(shui)(shui)换(huan)(huan)(huan)热(re)(re)(re)(re)1热(re)(re)(re)(re)水(shui)(shui)(shui)入(ru)(ru)口(kou)(kou)速度(du)边(bian)界m/s。

换热器(qi)作为化(hua)工(gong)过(guo)程机(ji)械的(de)(de)(de)(de)典型产(chan)(chan)品,是(shi)工(gong)艺过(guo)程中必不可(ke)少的(de)(de)(de)(de)单元设备(bei),地(di)应用于石油、化(hua)工(gong)、动力(li)、核能、冶(ye)金、船(chuan)舶、交通(tong)(tong)(tong)、制(zhi)冷、食品及(ji)(ji)制(zhi)药(yao)等工(gong)业部门及(ji)(ji)**工(gong)程中。其(qi)材料及(ji)(ji)动力(li)消耗占整个工(gong)艺设备(bei)的(de)(de)(de)(de)30%左右,在化(hua)工(gong)机(ji)械生产(chan)(chan)中占有重要(yao)的(de)(de)(de)(de)地(di)位。如何提高换热器(qi)的(de)(de)(de)(de)紧(jin)凑度,以达到在单位体(ti)积上传递更(geng)多的(de)(de)(de)(de)热量,一(yi)直是(shi)换热器(qi)研究和(he)发展应用的(de)(de)(de)(de)目标。器(qi)件装置微(wei)(wei)型化(hua)(Miniaturization)的(de)(de)(de)(de)强大(da)发展趋势推动了微(wei)(wei)电(dian)子技术的(de)(de)(de)(de)迅(xun)猛(meng)发展和(he)MEMS(micro—electro—mechanicalsystem)技术的(de)(de)(de)(de)不断进步,也(ye)推动了更(geng)加高效(xiao)、更(geng)加小型化(hua)的(de)(de)(de)(de)微(wei)(wei)通(tong)(tong)(tong)道(dao)换热器(qi)(micro-channelheatexchanger)的(de)(de)(de)(de)诞生。创(chuang)阔能源科技可(ke)制(zhi)作几微(wei)(wei)米(mi)到几百(bai)微(wei)(wei)米(mi)微(wei)(wei)型槽，S型，圆筒形，蛇形等。创(chuang)阔能源科技，可(ke)根据不同的(de)(de)(de)(de)要(yao)求制(zhi)作设计微(wei)(wei)通(tong)(tong)(tong)道(dao)换热器(qi)。创(chuang)阔科技微(wei)(wei)通(tong)(tong)(tong)道(dao)换热设计加工(gong)制(zhi)作。

“创阔科(ke)技(ji)(ji)”反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)器(qi)既可在(zai)研发(fa)(fa)中(zhong)用(yong)(yong)于(yu)多(duo)功能合(he)(he)成(cheng)(cheng)工(gong)艺评估平台，也可用(yong)(yong)于(yu)小批(pi)量(liang)定制化(hua)(hua)(hua)学(xue)品(pin)(pin)(pin)的(de)(de)迅速生产(chan)(chan)(chan),因为它具有(you)80吨的(de)(de)液体年通量(liang)能力.“创阔科(ke)技(ji)(ji)”反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)器(qi)较多(duo)用(yong)(yong)于(yu)研究(jiu)院所，高校(xiao)和(he)企业的(de)(de)实(shi)验室，致力于(yu)“连(lian)(lian)续流”化(hua)(hua)(hua)学(xue)合(he)(he)成(cheng)(cheng)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)工(gong)艺方面的(de)(de)研究(jiu)和(he)开发(fa)(fa)。“创阔科(ke)技(ji)(ji)”微通道(dao)连(lian)(lian)续流反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)器(qi)成(cheng)(cheng)功应(ying)(ying)(ying)(ying)(ying)(ying)(ying)用(yong)(yong)于(yu)多(duo)种反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)金(jin)属有(you)机多(duo)步化(hua)(hua)(hua)学(xue)合(he)(he)成(cheng)(cheng)：应(ying)(ying)(ying)(ying)(ying)(ying)(ying)对不稳定中(zhong)间产(chan)(chan)(chan)物(wu)难题(ti)。气-液-固浆状流，选(xuan)(xuan)择(ze)(ze)性(xing)(xing)(xing)加氢：高转化(hua)(hua)(hua)率(lv)，选(xuan)(xuan)择(ze)(ze)性(xing)(xing)(xing)好(hao)。二肽(tai)合(he)(he)成(cheng)(cheng)：选(xuan)(xuan)择(ze)(ze)萃(cui)取(qu)和(he)连(lian)(lian)续反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)耦合(he)(he)提(ti)(ti)高产(chan)(chan)(chan)品(pin)(pin)(pin)提(ti)(ti)取(qu)率(lv)。光化(hua)(hua)(hua)学(xue)合(he)(he)成(cheng)(cheng)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)（氯化(hua)(hua)(hua)、溴化(hua)(hua)(hua)等）：易(yi)于(yu)控制，提(ti)(ti)高收(shou)(shou)率(lv)。简化(hua)(hua)(hua)传(chuan)(chuan)统的(de)(de)磺化(hua)(hua)(hua)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：采(cai)用(yong)(yong)工(gong)业硫酸，无需SO3也能达到(dao)高收(shou)(shou)率(lv)。格氏(shi)试剂制备：易(yi)于(yu)精确控制，提(ti)(ti)高下游产(chan)(chan)(chan)品(pin)(pin)(pin)纯度(du)。低温(wen)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：-50°C的(de)(de)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)在(zai)0°C完成(cheng)(cheng)不影响收(shou)(shou)率(lv)，-20°C的(de)(de)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)能在(zai)常温(wen)下实(shi)现。贝克(ke)曼重排反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：工(gong)艺稳定，收(shou)(shou)率(lv)提(ti)(ti)高。选(xuan)(xuan)择(ze)(ze)性(xing)(xing)(xing)硝化(hua)(hua)(hua)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：减少溶剂用(yong)(yong)量(liang)，提(ti)(ti)高收(shou)(shou)率(lv)，更安全环保。过氧(yang)(yang)化(hua)(hua)(hua)物(wu)合(he)(he)成(cheng)(cheng)：高效(xiao)(xiao)安全，可以(yi)在(zai)线生产(chan)(chan)(chan)，很好(hao)改善过氧(yang)(yang)化(hua)(hua)(hua)物(wu)物(wu)流过程和(he)成(cheng)(cheng)本。气-液两相(xiang)（纯氧(yang)(yang)）氧(yang)(yang)化(hua)(hua)(hua)反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：操作安全，传(chuan)(chuan)质效(xiao)(xiao)率(lv)高，选(xuan)(xuan)择(ze)(ze)性(xing)(xing)(xing)好(hao)，溶剂用(yong)(yong)量(liang)少。酯化(hua)(hua)(hua)和(he)水解反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)：高效(xiao)(xiao)稳定，收(shou)(shou)率(lv)好(hao)。高效(xiao)(xiao)性(xing)(xing)(xing)：独特的(de)(de)微通道(dao)设(she)计，传(chuan)(chuan)质效(xiao)(xiao)率(lv)是釜式反(fan)(fan)(fan)(fan)(fan)应(ying)(ying)(ying)(ying)(ying)(ying)(ying)釜的(de)(de)10到(dao)100倍以(yi)上。创阔科(ke)技(ji)(ji)致力于(yu)加工(gong)设(she)计微通道(dao)换(huan)热(re)器(qi)。天(tian)津微通道(dao)换(huan)热(re)器(qi)欢(huan)迎来电

换热(re)器多结构(gou)置换，加工制作创阔科技(ji)来(lai)完(wan)成。徐汇区紧凑型多结构(gou)微通道换热(re)器

创(chuang)阔能源科技(ji)临界热(re)(re)流(liu)(liu)(liu)(liu)(liu)密(mi)度对于(yu)有相变的(de)(de)(de)换(huan)(huan)热(re)(re),微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)中的(de)(de)(de)临界热(re)(re)流(liu)(liu)(liu)(liu)(liu)密(mi)度现象不(bu)同于(yu)常规(gui)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)。微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)中临界热(re)(re)流(liu)(liu)(liu)(liu)(liu)密(mi)度的(de)(de)(de)产(chan)生是由于(yu)微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)的(de)(de)(de)蒸汽(qi)阻塞。在达(da)到(dao)临界热(re)(re)流(liu)(liu)(liu)(liu)(liu)密(mi)度之前,微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)的(de)(de)(de)流(liu)(liu)(liu)(liu)(liu)动和(he)(he)传热(re)(re)主要(yao)(yao)是周(zhou)期性的(de)(de)(de)过(guo)冷流(liu)(liu)(liu)(liu)(liu)动沸腾,从微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)逸(yi)出(chu)的(de)(de)(de)汽(qi)泡和(he)(he)进入微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)的(de)(de)(de)液体反复(fu)交替冲刷微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)。一(yi)旦达(da)到(dao)临界热(re)(re)流(liu)(liu)(liu)(liu)(liu)密(mi)度,微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)中的(de)(de)(de)流(liu)(liu)(liu)(liu)(liu)动和(he)(he)传热(re)(re)主要(yao)(yao)是一(yi)个(ge)(ge)蒸汽(qi)周(zhou)期性逸(yi)出(chu)的(de)(de)(de)过(guo)程。一(yi)直持续到(dao)过(guo)热(re)(re)蒸汽(qi)的(de)(de)(de)出(chu)现,直到(dao)整个(ge)(ge)微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)被过(guo)热(re)(re)蒸汽(qi)阻塞。入口(kou)段效应Nusselt数随无量纲加(jia)热(re)(re)长度Lh的(de)(de)(de)增加(jia)而减(jian)小。而对于(yu)常规(gui)尺度下圆管(guan)内层流(liu)(liu)(liu)(liu)(liu)换(huan)(huan)热(re)(re),当Lh=,换(huan)(huan)热(re)(re)趋于(yu)充分发展状态,Nusselt数趋于(yu)定值。根据Lh的(de)(de)(de)取(qu)值范围≤Lh≤,可以计算得到(dao)换(huan)(huan)热(re)(re)入口(kou)段长度占(zhan)总通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)长度的(de)(de)(de)百分比(bi)为(wei)。入口(kou)段效应对工质换(huan)(huan)热(re)(re)的(de)(de)(de)影响十分。徐汇区紧凑型多(duo)结构微(wei)(wei)通(tong)(tong)(tong)(tong)(tong)道(dao)(dao)(dao)换(huan)(huan)热(re)(re)器

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