Rapid Numerical Estimation of Pressure Drop in Hot Runner System
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Updated: Nov 15, 2025

A Cost-effective and Reliable Method to Predict Mechanical Stress in Single-use and Standard Pumps
Published on: August 5, 2015
Jae Sung Jung1, Sun Kyoung Kim1
1Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea.
Abstract:
To determine dimensions in the hot runner systems, given a material, it is necessary to predict the pressure drop according to them. Although modern injection molding simulators are able to evaluate such pressure drops, they are expensive and demanding to be employed as a design utility. This work develops a computer tool that can calculate a pressure drop from the sprue to the gate assuming a steady flow of a generalized Newtonian fluid. For a four drop hot runner system, the accuracy has been verified by comparing the obtained results with those by a commercial simulator. This paper presents how to utilize the proposed method in the hot runner design process.
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