outlet header meaning in English

出口集管
出口联箱
出口总管
排水干管

A nonlinear mathematical model is developed to determine the flow rate distribution in the parallel tubes of boiler superheater and reheater by depending on the relation of pressure drop among individual tubes and accounting for the static pressure variations in the inlet and outlet headers
根据并联管组各根管子进、出口压力降之间的关系，并考虑到分配集箱与汇集集箱中流体的静压变化，建立了锅炉过热器、再热器流量分配的非线性数学模型。