总压降 meaning in English

general pressure drop
overall pressure drop
total pressure drop

The experimental results of the flow characteristics of the mmc heat sink indicate that the critical reynolds number signifying the transition from laminar flow to turbulent flow is in advance ; under the same experimental conditions , the variation in entrance direction of the microchannel inlet and outlet has little effect on the microchannel ; the experimental values of the friction factor of the de - ionized water in a microchannel agree well with those calculated using the theoretical laminar formula ; furthermore , a comparison of the experimental results and simulation results shows that navier - stokes equation and rng - turbulence model can be used to model the laminar and turbulence flow regions in a microchannel ; meanwhile , the correlations of the flow resistance in the turbulent flow regions for the de - ionized water as the working fluids are obtained from experiments
对歧管式单通道热沉流动特性的研究结果表明,微通道内流体流态由层流向紊流转变的临界雷诺数提前;改变流体的进出口方向对热沉总压降造成的影响很小;摩擦系数的实验值与理论值较接近;数值模拟结果能够与实验值较好吻合;并由实验给出了紊流区流动阻力的实验关联式。此外,选用十二烷基硫酸钠( sodiumdodecylsulphate , sds )以及烷基多糖苷( alkylpolyglycoside , apg )作为减阻添加剂,研究了表面活性剂添加对微通道流动特性的影响。