An Investigation of Condensation Heat Transfer of Dowtherm-A in Polymer Solidification
Bibliographic record
Abstract
Polymer which is used in tire cord manufacturing, is transferred with jacketed transfer line and heating box to provide thermal stability of the system after extrusion process. The heating box is heated with vapor phase Dowtherm-A to compensate the heat loss of the polymer. In order to increase heat transfer on the condensation surfaces, reducing the thickness of condensed fluid film is essential. In this study, inlet mass flow rate of Dowtherm-A was investigated with steady state analyses. Results show that fluid moves through polymer pipes for higher inlet mass flow rate while it loses its energy and faces towards solidification chamber for lower inlet mass flow. Required Dowtherm-A mass flow for heat equilibrium at 300C was calculated 0.0035 kg/s for this system. In order to understand the effect of surface inclination over fluid film thickness two different solidification chamber designs were investigated. Heat transfer rate is improved by lowering the fluid film thickness with inclined top surface in comparison to flat top surface. Therefore, heat transfer rate of solidification chamber of inclined top design is %3.5 higher than flat top design. It was also observed that approximately %46,1 of the heat is transferred to solidification chamber and %3,9 of the heat transferred to polymer pipes, whereas another half of the heat is lost due to heat transfer with ambient air. Total heat transfer in condensation surfaces was calculated as 1008 Watt for the inclined top design.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".