The geometry of the die has been affecting the operating point of the extruder-die system. The size and shape of the die depend on the desired extruded hydrogen ice pellet. The present investigation is for a 3 mm cylindrical pellet having a length of 25 mm. The length of the die is selected based on enhancing the operating point of the die-extruder system. The determination of optimum die length is vital because it decides the pressure drop and viscous dissipation. After incorporating with extruder characteristics curve, it decides the operating point of the system. To understand the effect of die length and temperature on the change in pressure and viscous dissipation, the extrusion die was numerically simulated with ANSYS POLYFLOW CFD software. In this research paper, the rheological behavior of solid hydrogen is predicted at 10 K and 13 K. In the temperature range of 10 K−13 K the hydrogenic fuel solidifies. The isothermal CFD simulation for different flow rates has been done to examine the change in pressure and viscous dissipation. The results depict that the viscous dissipation is highly sensitive to the die length and temperature of the hydrogen. The proposed correlation will be used for pumping characteristics of screwtype extruder systems to get the operating point.