Microwave Heating of Water and Cyclohexane: A Molecular Dynamics Study
Bibliographic record
Abstract
The oil sands of Western Canada are among the most abundant and economically important unconventional petroleum resources. Hydrocarbon extraction from oil sands is conducted using warm water or in situ technologies that face considerable environmental challenges. Oil sands can also be valorized using the alternative method of non-aqueous extraction (NAE). However, NAE faces the challenge of solvent removal from post-extraction gangue. Microwave heating (MWH) has been explored as an energy-efficient approach for recovering the residual solvent from the gangue. In this work, the MWH of solvent-water systems present in the pores of NAE gangue was studied using molecular dynamics simulations. In particular, the temperatures changes of water and the NAE solvent cyclohexane were investigated under an external electric field, representative of MWH. The two liquids were simulated in monophasic and biphasic unit cells, applying an electric field with strengths of 0.01 V/nm and 3 V/nm and frequencies of 915 MHz, 2.45 GHz, and 100 GHz under constant pressure or constant volume condition. It was found that the applied electric field heated up the water molecules, due to their high dipole moment, but did not heat the nonpolar cyclohexane molecules that were transparent to the electric field. The simulations of biphasic systems showed that the temperatures of both water and cyclohexane increased, indicating that water was heated by the electric field and its thermal energy was transferred to the cyclohexane. Among the electric field strengths and frequencies tested, only the strength of 3 V/nm provided sufficient heating for each frequency applied, while the strength of 0.01 V/nm was too weak and the frequency of 100 GHz caused rapid heating. The heating mechanism was further explored using the rotational autocorrelation function and diffusion coefficient. It was found that the MWH increased both rotational motion and diffusion. The temperature increase and molecular motion were correlated to explain the microwave heating and thermal transfer. The study provides a possible explanation of the solvent recovery from the gangue generated from NAE using MWH.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".